The Panasonic GH5 is well known to be a great camera for video and I can confirm that see my latest videos
Clearly the camera is fantastic and with the right set up that I will cover in future posts it takes amazing video.
I wanted to start however from photography as the GH5 also takes great still images.
First and foremost macro. In general terms the lens choice of other micro four third also applies to the GH5 so my favourite lens is the Olympus 60mm. Alternatively if you don’t have that lens and you don’t have extremely small subjects you can get good results with a zoom lens I use the Pana 14/42 MKII but other work well too.
In terms of arms strobes nothing changes so my current rig is based on a Nauticam NA-GH5 housing and two Inon Z240. I have each arm set with 1x 8″ and 1x 5″ arm segments you will notice that the longer arms is closer to the camera this because in macro you will usually shoot above the sand so this makes it easier.
For wide angle the situation changes slightly as I use a 12″ arm segment as in the rig below.
For wide angle the arms return to a standard situation with shorter segment close to the housing. The same configuration applies if you shoot the 8mm fisheye.
In terms of floatation the GH5 housing is heavy with the 35 macro port is 720 grams and with the fisheye 620 grams. For macro I like my set up to be negative so less floats . For wide angle in case you take slow shutter speed shots I also use the tripod kit for the NA-GH5 this is not as good as a complete tripod but works well in wrecks
In the next posts I will talk about video as here there is a question about diopters and which ones do I use. Lights is also a topic of contention and will discuss few options there too
It is not a mystery that even the new Mark IV version has issues with custom white balance.
The ergonomics have not changed and you need to go into photo mode to set custom white balance but generally underwater results are poor. Using filters is therefore a necessity also on the new 4K version.
RX100 Mark IV Video Behavior
The RX100 offers now a 4K 100 mbps mode and can use picture profiles.
I have used a modified version of PP6 that use the cine2 gamma curve, I have however changed the colour to the Pro mode and changed a number of other settings in my last video in Puerto Galera.
The water was green and murky but this gives you an idea of what you can get.
Filter Options and Wide Angle
Although the Nauticam WWL-1 is the best lens for the RX100 it does not take filters and therefore is not adequate for video.
In this review clip you can see the options available on the market.
In terms of wide angle you have two options for 4K:
Both lenses work fine in 4K however the older UWL-100 achromat does vignette in photo mode.
The UWL-H100 offers a very wide field of view also in HD mode with no vignette and accepts the mangrove/deeproof filter.
This filters is loaded with magenta so I suggest adjusting the tint in the auto white balance mode to +2 green.
The UWL-100 works fine in 4K and is wider than the UWL-H100 however has only the M67 mount. If you have one of those lenses you can use the Ikelite 6442 filter. This filter required you to remove the rubber ring on the lens and does work quite well except has a yellow cast to it you can reduce by changing the tint to +2 blue and increasing also magenta to +1.
For flexibility purposes probably the UWL-H100 is better as it takes the bayonet but the UWL-100 is really wide and has a little less fringing. Some people do like the UR/PRO filters better.
I hope you find this post useful and good luck with getting the best colours from your Sony RX100 Mark IV
So time has come for my first video with a micro four third camera the Panasonic GX7. I had only 3 dives in Sharm and conditions on Naama Bay beach were not the best but still good enough to give the set up a good try, this is the resulting video.
I used the Nauticam housing with the Macro 35 port and the M67-LD adapter so that I could use the Inon UWL-H100 wet lens.
As it is not possible to fix the position of the lens I had to take the hood off and therefore I used an Ikelite UR/PRO filter for the 100mm lens. I had to use gaffer tape on the lens and inside the filter or it would be loose but it worked.
The first dive was with the URPRO filter in auto white balance, I was hoping this would give me good results but instead everything came with a strong yellow cast.
From the second dive I used custom white balance and the results were much much better.
To give an idea of the issue this is a shot of a grey card with the UR/PRO filter on land with white balance fixed.
You can see what kind of effect the filter bear it is orange in colour.
Other than this I was pretty happy with the GX7 especially because I could use the full zoom with the wide angle lens this is the first time I see it working. The moray eel shot towards the end of the video is an example.
Back home I was not happy at all about the UR/PRO and the inability to work with auto white balance. Probably I could have played with the tint but it did not come to mind. So I got in touch with Peter Rowlands of Magic Filters to see if they had an option that would fit on the Ikelite mount. Peter sent me two sample and they fit perfectly in the ikelite frame, though this is not commercially available I guess you can request those if you are not happy with the ikelite UR/PRO.
This is the same test card with the magic auto filter.
You can see that it looks less orange and also slightly colder.
I did some tests and the UR/PRO is a warmer filter with 2700K temperature whilst the magic auto is 3200K. The magic is however more red and has more magenta tint than the UR/PRO.
For me this means that the magic will work better in auto and will require less custom white balance. However those 500K difference mean you will eventually need to custom white balance once you go below 18-21 meters. I know people say filter work until 21 meters anyway but I have tried with deeproof down to 30 and on a bright day it was still good.
So if you are not happy with the yellow cast of your UR/PRO in auto white balance is definitely worth giving magic filters a go.
The GX7 confirmed all the good features including the ex tele mode
Here the shrimps are shot with a single Inon UCL-165 and then the close up of the head uses ex tele that pushes well over super macro.
Look at the incredible ability to refocus in video mode. See how focus locks on the shrimps when I press the button.
Overall the GX7 can do pretty much everything on a single dive with a wet wide angle lens and a close up lens. You can cover from 100 degrees wide to super macro. The fact you can zoom with the wide angle removes the need to take the lens off at every occasion and in fact in the red sea you barely need to have any other lens.
I was not particularly happy with the lack of hood that the ikelite filter wants removed so I experienced the occasional flare. Still pretty good result.
The clip looks much better at home than it does on youtube where the gap with the RX100 seems much smaller.
So as far as video is concerned if you don’t need 4K the GX7 gives you extremely high quality footage and reasonable cost.
A final note I shot this video in 24p at home I can’t tell the difference with 25p see if you can see it!
Following from my previous post I managed to get together a clip out of the 5 dives I did
The first day was somewhat plagued by visibility a bit lower than the norm for the location but the second day was fabulous
For this trip I brought with me the Inon UWL-H100 and the red push on filter from deep roof H20 and the Inon UCL-330 as I was expecting medium size fish and nothing really small
Here is the outcome
I am quite happy how things turned out so let me share the settings with you
First I shot most of the footage in 25p AVCHD mode only some small sections are shot at 50p and actually I did not need to slow down any of the material.
For the wide shots I used steady shot in normal mode and shutter priority at 1/50th. With the filter on I had auto white balance with tint correction G2 A1. I noticed that the camera was giving red tint in some situation and so added a bit of green back. The Amber correction instead is for the RX100 itself the camera does not have vibrant yellow and is a bit blue.
For the first time I use creative mode changing the standard contrast to -3 in order to prevent crushing of blacks.
Exposure was set all along to -1/3 and metering to multi area with AUTO ISO limited 160-800.
I think the results are so good that in fact I have performed no colour correction to any shots in ambient light.
For shots with lights I set up first colour temperature to 6500K and A1 to match the lights but then in some of the far shots this resulted a bit cold so I adjusted very slightly in post the temperature.
Only 40″ are adjusted in the whole video in essence is as shot and the editing took me half hour.
I did a bit of analysis and the camera was operating for most at ISO200 with aperture around f/3.5 – f/4.0 which is really the sweet spot of the lens.
I did have some challenges using the UCL330 for some nudibranches that really required a stronger lens so they look a bit small, there was also surge so I had to fight with focus problems but all in all very happy.
The longer working distance of the UCL330 (20-30 cm or 8″ to 1′) proved challenging on walls as you are too far to hang on to anything or use a stick. I will bear this in mind in the future.
For the close up shots I used steady shot active.
I also wanted to say that a few times the camera did manage to white balance properly however the results were not exciting and frankly not worth the hassle. Using the filter is just so much better with the auto white balance.
I receive so many queries about equipment that I thought I would put some of my items on sale.
My cupboard is near enough to explode and I need to streamline the equipment I have. Currently I have 3 strobes, a huge selection of ball and clamp arms, 3/4 and 1/2 locline arms, float arms, floats, video lights, tray bases, around 15 clamps and some 6 macro wet lenses and 3 wide angle wet lenses with 3 different mounts.
I guess it is time for a clear up so I will add a section with items on sale where I will list some of the combination items.
The idea is to provide a full set of lenses or a tray + float solution as those seem to be the most asked for items in my set up.
So if you look on the menu you will see the link Sales items with details of the various sets. I can also sell the items individually but I think this makes little sense as I’d rather do that on ebay.
Many people read my posts and then go to gear shops but there there is always a little mistake or problem getting the whole set up from here you avoid that. I priced the items based on 50% of retail UK price and I would ship to UK and Europe, other overseas will attract import duty so it is not worth it in my opinion.
If there is anything you like use the contact form on the relative page to inquiry
Once again Sony has updated their RX100 camera with a stunning new release that will surely be a market leader at least until the release of the new promised Panasonic large compact sensor with 4K video recording.
So the question is again is it worth throwing our hard-earned money to this new model and housing or should we stay with what we have got? The Mark I and II are still available at reduced price though it is becoming harder to find Mark I housing as new.
The answer to the question is: it depends on what you are planning to do with your RX100, for some users an upgrade may not be required or even not advised let’s see why. no don’t waste any time with the Mark III.
Every time a new camera is released and reviewed I get a bunch of emails with subject: New Camera XYZ what do you think?
The best reviews you find online are made by sites that specialize in land photography and no consideration is given to underwater use. So not necessarily a camera that is a top performer on land will remain such underwater as this depends on specific characteristics that may be different or even opposite to land requirements.
So those reviews cannot be taken as they are they need interpretation. Personally I use two sites for camera reviews imaging resource and dxo mark I use the first to understand ergonomics, performance and to compare images with other cameras side to side, and the second to check sensor quality and lenses. Imaging resource has made a good article to compare the various RX100 on land read it here
If you look at a sensor comparison on DXOMark you would conclude that there is no need to upgrade at all if you use your camera primarily for still pictures as the sensor are practically identical in performance as this table demonstrates:
As you can see the differences in dynamic range, color depth or ISO are pretty much intangible.
However there are other metrics that are also important let’s see which ones and why.
We want our camera on board flash to recycle quickly after a full dump as the RX100 has only TTL flash and the flash can’t set to a minimum manual setting without consequences. Those are the flash recycling times at full output (a full dump will always occur when you don’t aim strobes directly at the subject for example wide angle)
Mark I: 7.2 seconds
Mark II” 4.4 seconds
Mark III: 3.3 seconds
The Mark III is pretty quick and the Mark II is acceptable the first release is definitely too slow.
Minimum Capture Area & Zoom
What is the smallest area that can be captured at wide end at the closest focus distance? This gives you an idea of out of the box close up performance
I do not have precise metrics yet but looking at comparable images on imaging-resource seems like the Mark III is worse than the Mark I and II of at least 20% with a capture width around 90mm versus the already not very good 76mm of the Mark I and II.
To fix this issue we use close up lenses in water that fix to a great extent the focal length and then zoom in to achieve magnification which means longer camera lens more magnification I roughly estimate that the Mark III will be worse of a factor of 0.7x so things will look 1.4x bigger with the Mark III this is terrible news for macro shooters as it means you need to be on top of the subject to fill the frame, this is in some cases not possible.
I have estimated that you need 11 diopters to achieve 1:1 macro so the Subsee 10 and Inon UCL100 that gave real macro on the Mark I and II won’t be sufficient. With two UCL-165 or Dyron 7 you are looking at 2.58″ or 6.5 cm from the back of the first close up lens that means you will be right on top of the subject which is not really an option.
Update July 18th: Nauticam has confirmed that even with their SMC lens the most powerful diopter on the market the capture area is 38mm wide so does NOT achieve 1:1 macro as I suggested…
Lens Focal Range
The new mark III has a 24-70mm lens compared to the 28-100mm of the Mark I and II what does this mean?
Less magnification with close up lenses and no real 1:1 macro
Vignetting or even not possible to use fisheye lenses designed for 28mm lenses
This means that with the Mark III your scene selection will be restricted compared to the 150 to 24 of the mark I and II.
Update 23 July I have done some tests that confirm my suspicions please look at the following frames. The Mark III once zoom to 28mm actually works fine with the Mark II housing except the power button.
With a single Inon UCL-165 (+6.06 in water) the minimum capture area width is 5.4 cm which is bigger than the Mark II 4.8 cm. Not only that the distance from the top of the lens is only 9cm.
With stacked UCL-165+UCL330 total power 9.09 diopter we get this
4.4 cm width however we start running into problems as the minimum distance from the lens is only 4cm.
We finally achieve 1:1 with two stacked UCL-165 however the distance from the top of the lens is 3cm definitely too little
I have also tried the Mark III at 28mm and it still vignettes with the Inon UWL-H100 in air until around 30mm. Instead the old UWL-100 28AD is fine at 28mm either way image looks narrower than with the Mark II but this may be an issue with the old housing.
So basically no macro with the Mark III and no decent fisheye as expected.
Underwater Photography Conclusion
Due to the reasons above the best camera for the job is the RX100 Mark II, with the Mark I coming close but being penalized by the strobe recycle time, the Mark III really is not an option for the serious shooter due to limitations of the lens.
Let’s have a look at some other features of the Mark III that are not relevant for stills as much as they are for video.
Shooting at the surface with plenty of ambient light or on land can create problems if you want to follow the 180 shutter rule, the ND filter of the Mark III ensures your footage will be smooth on land and in water. Take into account that on land you can apply optical ND filters (I have it for the Mark II) so this is really for underwater use when you are shooting at 1/50 or 1/60 shutter speed and the scene is too bright when you hit f/11 and the lowest possible ISO. Having now tested this feature I confirm it is really valid on land on a bright day to keep the aperture wide.
Clear Image Zoom
This is a special digital zoom with edge enhancement that only worked on JPEG stills on Mark I and II but is now available on video on the mark III. This means an additional 2x zoom is available bringing the focal length to 140mm that is more than adequate for macro. This is not an option on RAW images so irrelevant for still users.
23 July update Having done some tests for macro video (as stacking two diopters is not an option) the image quality suffers but anyway this is all you are left with lacking any other options.
The Mark III adds a further stabilizer mode with additional crop that takes the lens to 96mm equivalent in video mode. This is well worth for super macro hand-held footage and effectively provides an option where you can either use the super steady shot and no clear image zoom when hand-held or leave on only the optical stabilizer and use clear image zoom. If you shoot macro on walls and not on flat sand this is a well worth feature.
Update 23 July 2014
Following a side by side comparison you can find on this link
It follows that there is really no 5 axis stabilisation and only an additional mode with more crop with correction for rolling shutter that anyway does not really work!
Full Sensor Readout Video
The mark III reads the whole sensor not just alternate lines when capturing video this increases should increase the resolution to a great degree and increases the perceived resolution and clarity of your videos. However this does not seem to correspond to real life tests. See this sample with a side by side comparison the Mark III looks visibly worse than its predecessor even on the higher bitrate XAVC!!!
The Mark II introduced a well welcomes 24 Mbps 24/25 fps mode now the Mark III introduces a 50 Mbps mode in XAVC (that can be rewrapped into normal MP4) that produces even better footage although it will be quite demanding on your workstation and most likely some of your home devices will struggle playing the files (my Apple Tv 3rd generation only plays up to 25 Mbps) when uploading files online this will downgrade to 8 Mbps so won’t matter unless you have a good player at home. improves nothing and requires manipulation as the files are actually not MP4 compliant as they have WAV audio (!) they are also inside the AVCHD folder which is painful. As seen above seems like the encoding has got worse on the AVCHD files and only the higher bitrate compares but still does not match the mark II at the lower 24 Mbps!!!
You can now connect the Mark III to an external HDMI recorder if you are into that kind of semi pro usage. For the normal user this is not relevant: if you are into spending that money probably you have already a DSLR or a Panasonic GH4.
Video Auto Focus
The auto focus in video has got worse you can see an example in the stabiliser test, and actually plenty of frames are blurred on the mark III. Awful!
Underwater Video Conclusion
The Mark I with only a 28 Mbps 50/60p mode is definitely a poor choice, the Mark II is acceptable to most users. and the mark III promises even better performance if you are a serious video user and have another camera to take pictures the Mark III may be well worth it.
The Mark III despite some useful feature is actually a let down and perform worse in practical terms than the mark II that remains my camera of choice.
If you have a Mark I camera and are frustrated with flash recycling you should be looking at a cheaper upgrade to the Mark II.
If you have a Mark II and your priority is photography upgrading is NOT recommended.
If you don’t have any RX100 get yourself a Mark II or wait for the new Panasonic as the Mark III is pretty much a pile of crap.
Is it the first time I am actually sending back a camera and invoking consumer rights but when I spoke to the camera shop they told me they had other returns and this is not really an upgrade!!!
The above image was shot at 100mm equivalent with one diopter with the RX100 Mark II. You won’t be able to fill the frame with the same close up lens and the Mark III camera
The time finally came for our trip to Galapagos and I was ready with a set of think rubber suits to overcome the cold water. I just bought a 5mm Oneill Sector (wonderful suit) a 3mm hooded vest, kevlar gloves and a 5mm 4th Element short john. Well the short john was not used and for most I used just the wetsuit and a set of O’Neill Thermo X unders (very recommended) as El Nino is coming and the water was warmer at 25-27C or 77-80F.
This means lack of schooling hammerhead at shallow depth close to the reef, they were in the blue. We had however our good dose of schooling barracuda, tuna (in the 1000s) and even galapagos sharks
This is the video I produced
If you have problems with playing in your country use vimeo instead
The conditions were difficult with low visibility and in some sites very green water as you can see here
Questions will come about what I used etc etc so here is the list
Sony RX100II in Nauticam housing
FIx adapter for Inon LD mount
Deeproof blue water filter
Sola video lights 1200 (just few shots of the barracudas and some close ups)
Combination of arms and sometimes no arms
Ultralight tray TR-DM with extension and handles
The video has been produced with iMovie 9.0.4 no stabilization performed except the scene with the moray eels mating (very mild)
I shot the whole trip in shutter priority 1/50th of a second in the 25 fps 24 Mbps format. After some tests at home I have decided to use this mode as I can’t physically play the 50 fps files the camera produces on any of my devices differently. The 25 fps gives a film look and very smooth footage. This format is only available on the RX100II and not on the original RX100 so the consideration I made at the time for video settings of the RX100 remain valid.
The benefit of 1/50th shutter speed is a full f/stop of light the disbenefit is that at the surface and for backlit shots this is too slow, in those cases I go back to program mode or increase shutter speed to 1/100 or 1/200 or more.
For what concerns the editing I import the raw files in iMovie without using the conversion and then export with x264 using very slow preset and level 4.0 compatibility to use it with my appleTv.
I do minimal color correction in some cases I had to eliminate the red color cast of the filter when shooting upwards, to do that I change the white balance to top yellow until i remove the cast.
In some cases I had to put the green gain to the max for the same problem but in all other cases there is NO color correction in post.
When you work with AVCHD cameras the footage is compressed and the key is to get it right in camera.
As Galapagos conditions were challenging, although less than I expected, I used gloves in some dives to hang on to the barnacles and I also modified the set up to completely eliminate the lights.
I would dive with two 3″ segments and two 6″ Inon Mega float arms when I had the lights on and for other shots in ambient light I would have this set up here that looks odd but it is very effective and almost neutral at only 120 grams in water. The position of the floats means the camera stays upright at all times.
I would put a single Sola light on top of the housing not for video purpose but to signal the dive master when I was a bit far in the murky or dark waters. I used this set up on almost all blue water dives (Darwin and Wolf) and the normal set up with lights for the South and West sites with murky or green water.
There will be a separate post on the photos, I did a total of 18 dives with the camera of which 4 where photo and 14 video. You can see an example in the featured image.
I have now ran some statistics on the final clip that I produced
I used a total of 41 video clips:
ISO average was 273 with the following breakdown
2 clips at 160
30 clips at 200
6 clips at 400
3 clips at 800
f/stop average was 3.1 hyperfocal distance on average 1.16 meters. So if I were able to shoot without filter I would have not gained anything in terms of sharpness as most subjects were further away
I would consider the Galapagos and the dive trip I did not the best in terms of brightness and visibility so I would conclude that the RX100II with the Inon UWL-H100 and a red filter is the best set up for wide angle video in terms of performance, ease of use and flexibility.
During the London Dive Show I attended a talk from Martin where he covered a number of shooting situations and how to deal with them in terms of composition and settings.
There was a promotion for a two for one tuition day with him that my buddy was keen to take so few months later we made our way to Dorset for a day of underwater photography with Martin.
This will be my first day of shooting with the RX100 Mark II albeit in a pool with my new arms and lenses so I was looking forward to it.
We arrived in Poole the night before and got ready for an 8.30 start with Martin.
We started off with a review of some basic exposure concepts and then looked at competition winning pictures and trying to identify what makes a wow picture. It was extremely useful!
Afterwards we went through our trips pictures so he could see what needed improving. Then look at what was needed for the next trip.
With that in mind we set up to jump in the pool to take some pictures the objective was to improve my buddy close ups and portraits as apparently her wide angle is as good as it gets with the Canon S95 used see featured image on this post.
Pool conditions were low visibility and plenty of suspended particles as the pool is used for kids swimming lessons let me give you an idea!
The first task was to shoot a frog with a view of eliminating shadows in its mouth. Start with one strobe and finish off with two.
The frog with the bare port gives you an idea of the size and the complexity of the task with one strobe. There are shadows in his mouth.
I then shot a portrait at 50mm, the reason why you see shadows more on the left is because I set the strobe at different powers.
The magnification of the RX100 is little so I went on with a first Inon UCL-165 and full zoom at 100mm equivalent. Note that everything is pretty much sharp at f/11.
With two Inon UCL-165 focusing on the mouth will result in this and the eyes being in focus and the rest blurred because of lack of depth of field.
I then moved to an Octopus rich of textures. I took the first shot with my Inon UWL-100 28AD with dome.
The same octo at 28mm fills the frame much more of course.
The Octopus at 50mm looks even better. I have topped up the lighting on this one.
I then took this guy with a single UCL-165 note the depth of field insufficient to keep the back of the head in focus, results though are exceptional.
With two close up lenses we go back to the depth of field problem even at f/11.
I thought I had at that point nailed all focus and strobe issues, especially considering I shot with single auto focus, I did not bother using manual focus at all with exception of some double diopter shots.
I then tried a few surface reflections with the fisheye this being the best.
You can see the outside of the pool and the windows on the top.
Afterwards made my own composition of statues for a fisheye shot that I think came out very well. The Z240 performed extremely well in both TTL and external auto as well as manual.
Martin asked me to have a go at the child with the dog as it is extremely difficult to lit up properly.
I went for an alternative strobe placement with light from the bottom as if it was in a gallery. He was impressed with the results.
To finish off my last task was the tongue and eyes of a lion that I shot with a single UCL-165.
Overall a great day and I definitely recommend you the tuition day with Martin. He is a great person and extremely good at teaching I can see the benefits my buddy had right away.
Lessons learned on the RX100
There were a few things that I learned about my RX100 still rig mode that I want to share with you.
The autofocus is incredible. I even used this for macro. If the camera does not focus is because you don’t have enough depth of field and that is it.
Best macro performance is with a single diopter and also had a benefit of an increased working distance, this means the shots will need cropping for extremely small critters
Two diopters resulted in near bokeh with less than 1mm in focus and difficult to autofocus (though the LCD is great and I could see if things were in focus or not I think this is personal and I would recommend DMF to others)
Performance at wide angle with the UWL-100 28AD with dome is stellar
Inon float arms (I used two 6″ segments) were perfect with lens holders on it.
Inon Z240 twin set with one in TTL and the second in external auto delivered creative lighting without headaches, remember to buy the AUTO diffuser that does not come with the strobe
Strobes in manual allowed for even more creativity and the level of precision compared to sea and sea was staggering
Despite pool conditions the RX100 focused well in low light and much better than the Canon S95 that was returning focus error on the same exposures. I will not bother having a focus light with this camera and only have a single sola on night dives
That’s all for now any question just drop a comment
Over a year ago I wrote a set of posts for the RX100 and some of the quirks of this wonderful little camera.
Steadyshot – aka Image Stabilizer
The RX100 has a specific Active mode for video not available when taking stills. I described the differences between those two modes in this post
Everyone is so obsessed of having the widest possible field of view that other more important considerations are completely missed out.
If you have ever shot a video with a GoPro underwater you know how bad is the quality of the image in the corners, this is because the flat port combined with the gopro lens create many optical aberrations.
Our RX100, especially the original Mark I, also has an issue in the corners, this is not just an underwater issue is also true on land. The lens on the camera has a lot of distortion and when corrections are applied to the image this effectively creates corner softness.
When we add a wide angle lens the image quality in the corners deteriorates further especially if the lens is flat creating a lot of chromatic aberrations that you can see in pictures with a blue or yellow halo around the edges.
Now the good news the Active steady shot mode crops the image of a factor of 1.15x getting rid of the majority of the corner softness.
There is of course a price to pay which is the loss of some of the angle of view. According to my calculation if you use an Inon UWL-H100 you start from more than the declared 100.8º more around 104º in fact. When the active mode is on this drops to around 95º. Remember all those values represent the largest incident angle that means the diagonal field of view.
A lens with 100º diagonal field of view means 90º horizontal. So after the active mode is engaged our horizontal field of view looks more like 84º which is equivalent to a 20mm lens. This is sufficient for most close wide angle shots and plenty for ambient light videos of large fish or wrecks. I generally suggest to keep the Active mode on, of course if you can be in a fixed position and hold the camera really steady you can also use the standard mode and obtain more field of view. There is a chance though that you will need to crop the extra field of view if you need to stabilize in the editing phase.
For macro shots without a tripod the steadyshot is a must and helps greatly. I do not even see a reason to take it off if you have a tripod as the RX100 does not have a particularly small capture area.
This brings the second subject: digital zoom, if you shoot pictures you avoid it as what you are doing is to crop the image, something you can do yourself in processing. In video though there is very little quality loss as we use just 2 megapixels of the 20 of the RX100 camera. In my test you can use digital zoom until the 2x multiplier is reached, this corresponds to 7.2x magnification and see no noticeable degradation in the image quality. The other benefit is that the depth of field is the same despite the magnification so you can save yourself stacking two diopters with all the difficulties that follow in terms of focus.
Digital zoom is always on in video mode and I recommend to use it with a single close up lens before embarking on dual diopters or a strong single diopter. Also take into account that with a single +6 diopter your working distance is around 4″ which is ideal for most critters except pygmy seahorse and bobtail squid or some shrimps.
In another post I have explained that getting hung up about light angle coverage is not really the only thing to consider, there is also luminous flux and quality of light. With my Sola 1200 I can cover something between 2 and 4 feet away with decent results further away is just back scatter. Generally this is ok for some close portrait work and close wide angle and of course not sufficient to cover part of a wreck or much larger subjects. You may decide not to bother at all with lights for wide angle and just render your deep wreck dives in black and white in this case consider that a pair of Sola Dive 800 at $399 are a high quality macro set up, function as dive light and provide some decent close wide angle portrait illumination. For macro shots you need much less than that, I set my fill light at minimum (300 lumens) and the main light at 2/3 which is 600 lumens, I can shoot at f/11 with this light intensity. You can see me shooting in the feature image.
So the time has come to talk about photography more in depth. I have actually given up stills in favor of video since a few years as I find video gets me closer to behaviors than stills do, I guess am just not patient enough to capture behaviors on still as that involves waiting!
Anyway this is the rig as it is today without the floats.
The RX100 is a demanding compact for the very same reason why it is the best compact the huge sensor it sports. If you come from shooting a canon or panasonic or even Olympus on a 1/1.7″ sensor you find the RX100 to be very unforgiving. In essence you can’t really just point and shoot you need to put some more thinking into your shots.
The rig that I have put together for stills has the same meticulous attention to detail than my video rig has, you would say OCD probably but here it is.
So let’s start with the housing, Nauticam just makes the best most ergonomic housing for the RX100 period. There is nothing you can think of improving about this housing. Even if the bulkhead connector is useless you can actually put a vacuum valve on it to put it to full use.
Nauticam do offer an M67 thread native on all their compact housings but I find this tedious to say the least. The beauty of a compact is that you can shoot wide and macro on the same dive, the M67 thread in essence negates this as it makes virtually impossible to change lenses on a dive. This is the reason why I went for the Inon 28AD mount for my rig using an inexpensive 10 bar adapter priced at $20 or £15.
Once you connect the Inon UWL-100 28AD the lens is very close to the housing to the point of nearly touching the port. This means you get no vignette with this lens with the added dome, and actually a larger field of view in water than you get with the UWL-H100. Why is that? The UWL-100 28AD has less magnification so it does not vignette even on land, once you add the dome you get almost the same field of view in water around 150º. The lens is just a tad lighter than the UWL-H100 with an in water weight of 400 grams.
The choice of the 28AD mount means you can only use the UCL-165AD close up lenses, that if attached would crash into the glass, you need therefore a 28AD->AD adapter from Inon.
You do get vignette until 50mm however this is not an issue as you shoot those lenses at the tele-end.
This is the whole lens set with the two adapters.
As discussed in other posts the two stacked diopters give you super macro, they are also light with 35 grams each in water. The small amount of fringing they give can be eliminated in lightroom with a single click.
The wide angle lens sports a 115mm optical glass dome with inner anti-reflection coating. If you are into observing fine detail you will notice that the dome is not actually a full semicircle but flatter, if you add the special coating this means no flare and increased contrast. If you wonder why shots taken with Inon dome lenses are sharper is because only 1% of the incoming light is reflected, against 3% of an acrylic dome, the glass dome due to the coating don’t flare, plastic ones do as simple as that.
Now let’s move on to the strobes a twin Inon Z240 set. I have been a sea and sea user for years until I managed to damage my YS-01 and got no assistance at all from S&S since then I decided to go elsewhere.
What I love about the Z240 is the variety of controls to manage shadows, the sharp aiming light with a red filter good for the most skittish critters. Contrary to what many people think I aim directly at the subject in macro as the distance is short and backscatter is not an issue so no point aiming the strobes away for me.
I happened to have a pair of Sea and Sea optical L cable that served me well and had no will to change, FIT produces this cost effective adapter that goes on your Z240 and makes it compatible, I just love it.
I believe Inon Z MV strobe head adapter has no equal in ergonomics but for some reason a part that is $20 in Japan sells at over $40 in US and £30 in UK so is not that popular. My second choice would be the Nauticam strobe adapter that has got the small feet needed to correctly lock on the strobe head.
With the Z240 doing wonders as aiming light there is no real room for a focus light however I have a set of Sola Video 1200 and what I like is that you can use them as dive light. I have connected them with a locline cold shoe, this will soon change to a ball mount, as the cold shoe is on the left side. Probably I will get a Sola Dive 800 so I can leave my two trays set for video and stills on the boat.
Looking at the tray I use ultralight, it simple and sturdy and allows me to center the port in the middle of the tray.
The most attentive will see that the two handles have different colors.
Why is that? Firstly I want to place the handles at maximum distance, second by placing two different handle I can ensure the ball is at the same height, this would not be true if I was using the same handle on both sides. I use a TR-DM with a TR-DUPL long extension to make the tray 30cm or 12″.
So this is what it looks like, there will be floats on it, I estimate I need 8 floats to make the rig neutral with the lenses off. I am planning to place 3 on each 8″ arm segment and two on the tray however I might change this to 2 on each arm and a bespoke float on the tray bottom. I will run some test to see what works best.
So that’s all folks surely there will be questions and I look forward to answer them.
Just want to remind you that if you are in the market for a compact still or video rig I provide a personal shopper service for £30 or $45 that provides an end to end service on your budget where all you have to do is to call the shop to pay. Of course we would discuss any observations about the set up before this gets finalized, but am sure better to spend a little amount instead of making expensive mistakes!
UPDATE 9 June 2014 I have made some more changes to the rig the current version (never say final) is here