Nauticam entered the wet lenses market with their SMC close up wet lens that was optimized for DSLR.
Then it released the CMC compact macro converter for compact cameras and micro four thirds and finally the Wet Wide Angle Lens I that is compatible with compacts, micro four thirds and also full frame cameras with 28mm equivalent lens.
Up to now all lenses were using the traditional M67 mount as most of the lenses, even the close up ones, are pretty heavy this means going for the dive with the same lens. Nauticam has developed the flip diopter adapter for flat ports to overcome this issue.
The flip diopter is a good solution for micro four thirds and DSLR but looks rather cumbersome on compacts as the image shows.
I asked Nauticam for a bayonet adapter and specifically if they could develop something for the Inon LD bayonet system that so far has been the reference for wet lenses for compacts and micro four thirds cameras.
Edward told me that due to the fact that the WWL-1 lens rear element is so large the Inon LD system was not an option so they went off and developed their own system.
I would like to thank Nauticam again for making those parts available before general availability.
Looking a bit closer to it you can see that due to the specific construction with two concentric rings you need a special tool to apply the adapter on the port.
Obviously as the Nauticam lenses use an M67 thread new adapter needed to be developed.
Nauticam does not use ABS plastic and uses aluminum for all their parts.
Now that the items have a bayonet adapter there is a need for a lens holder to put on the arms.
The lens holder is too big for a standard 5″ segment but looks in proportion with a longer segment.
The adapter is larger than the LD mount and a bit big for compacts to the point that even with a tray the adapter tips the rig back.
Another challenge is that this system is designed for Nauticam lens that have protruding rear element so when used with standard lenses there is a gap between the port and the wet lens that can be counter productive, not the end of the world and frankly the Inon system has the same problem. This however means that if you wanted to use this system with a different wide angle wet lens this would be suboptimal.
I am waiting for Nauticam to ship me back the WWL-1 so I can show how that lens performs on this system.
Another observation of course is that if you use this system for wide angle the super heavy WWL-1 and the fact that the adapter only works on a normal segment means your rig will be very heavy in water. I am going to discuss with Nauticam the possibility to have the adapter on a float arm however their carbon arms do not have any mounting point to be used.
Stay tuned for a full review of this adapter with the new 29 macro port that looks very promising for video.
I am just back from the Red Sea underwater photography workshop hosted by Alex Mustard, this time I took the Panasonic GX7 with me instead of the Sony RX100 Mark II.
There have been a few posts on wetpixel and scubaboard to say that advanced compacts are all an underwater photographer will ever need considering also the luggage restrictions that are becoming increasingly more demanding these days.
As I have been on the forefront of the advanced compact shooters I thought of giving you my view on the subject. This is based on observations that I have made on this and last year workshop observing the images of around 35 different photographer. The kit in use went from a Sony RX100 Mark II all the way to full frame such as the Nikon D810, and included micro four thirds, cropped sensor SLRs as well.
In general terms I consider only 4 characteristics when I compare images between cameras and those are:
Richness of color (color sensitivity)
Contrast (dynamic range)
The following comparison may be useful to understand the differences between various cameras, I did it on Dxomark and I own all those 3 cameras so I have a good idea on how they fare.
I already observed last year that when it comes to color there really is no perceived difference between the RX100 and a MFT camera. There is however a difference between compacts and MFT when you compare to a good cropped sensor like the Nikon D7100.
To make the point clearer this is a portrait shot with the RX100 Mark II
This is another portrait shot with the Panasonic GX7
Here I am not talking about the contrast of the image the camera produces but the amount of contrast in the scene that the camera can deal with or dynamic range.
I am going to use two black and white images for comparison
Sony RX100 Mark II
Again not much difference at all.
It can be useful to be able to shoot at high ISO however to be honest I have not yet found a reason to shoot at more than ISO 400.
This is a Panasonic GX7 at ISO 400
I looked at my RX100 shots and I could only find an ISO 160 shot
I did not take split shots with the RX100 and so there was no need for high ISO. For me shooting at high ISO is a bit overrated as with stabilization you can shoot underwater landscapes at 1/25 without issue and for moving fish I use strobes for most.
Should you need higher ISO though there is around one stop improvement in a micro four third to a 1″ compact and nearly two with a cropped sensor.
This is probably the only real difference between a compact and a micro four third and to be honest is only visible on a 4K monitor or if you print or zoom into the image.
Schools of fish are a good way to check sharpness
This shot with the Sony RX100 Mark II is sharp
However if we look at the Panasonic GX7 with the 8mm fisheye
We can see that there is a difference looking at the fish scales.
So in short if all you do is to look at images on the screen there really isn’t much in it, however if you have a high resolution screen or you print there is a considerable difference in sharpness between an advanced compact and a micro four third.
So what about video? If we consider HD there is no perceived difference in sharpness between clips taken with the Sony RX100 and the Panasonic GX7 until you go to High ISO.
At 4K I suppose we are back to similar considerations and micro four thirds should win but I have not done any tests so it is hard to say.
One thing that I do like about the Panasonic GX7 with wet lenses is that you can zoom through the entire range of the lens, whilst this is not an option on the Sony RX100.
So my conclusion is that if you are going on a trip and you are constrained by luggage limitations you can load camera, housing, wet lenses and two strobes in a back pack if you use a compact.
With a micro four third the strobes could end up in the luggage hold.
What about DSLRs? I found that if I compare shots with a good cropped sensor like the Nikon D7100 I can see difference in both colors, contrast the camera can cope and noise. The difference in sharpness seems to be less when you compare the panasonic 8mm fisheye with the tokina 10-17mm.
This should give an idea
Obviously once you are in the DSLR camp the size of the housing and its weight become the predominant consideration but so does the cost that doubles from a micro four third rig.
Youtube now supports double frame rate video 50p and 60p so what?
That is actually a legitimate question look at this example here which is a short clip from a trip to Barbados in 2013, this was originally shot on a Sony RX100 Mark II in AVCHD progressive 1080@50p 28 Mbps
If you don’t see the 50p option is because your browser operating system does not support it. You need the latest version of browser and operating system and a machine fast enough plus enough bandwidth. So for Mac this means OS X Yosemite and Safari and for Windows you need 8.1 and IE9.
I hope you enjoyed the clip now check this other one which is a instead shot at 25p with the same camera at 24 Mbps/
I think you can see by yourself which one looks better and it is the 25p clip despite an overall lower bitrate.
There are a number of reasons:
Underwater clips do not have a lot of action as you may think so extra frames go a bit to waste
The encoding which is how the clip is first recorded by the camera is not really that different.
The human eye does a great job at interpolating missing frames anyway
There is not really much more data in the 50p file compared to its 30p rendition
The image quality if you look at a still frame is better in the 25p clip.
There are of course benefits in shooting at double frame rate if you want to slow down the footage 50% speed but for what concerns your normal shooting you would say for that clip you could not tell.
Let’s think about it in simple terms if you have a clip shot at 25p with 24 Mbps you would expect something not quite double but a bit more for 50p instead you only have 28 Mbps. To be more precise you have 22 Mbps vs 26 Mbps video which is 18% more in Sony’s case. So that is not really much information more.
What is more interesting is the structure of the data what follows now is a bit technical but bear with me.
The first and third rows are representation of Sony 25p and 50p clips. The green bar are I frames that you can think of like a JPEG image, the red bars are P frames or prediction the only contain a delta from the previous frame not a full image.
You can see that in the first row there are 12 P red bar between each green I bar. This means that the GOP or group of picture is composed of a sequence IPPPPPPPPPPPP that repeats indefinitely.
On the 3 row there is a representation of a Sony 50p clip you can see that now there are 23 P frames between two I frames.
So the increment in full frame is limited however if we look at the sizes we see that the I frames in the 25p clip are 12% bigger and also the P frames are smaller.
So in short if you look at the image quality the 25p clip has more information in the full frames as well as for the predicted frames whilst the 50p clips has more frames but overall with less quality.
Which means that unless you are shooting something that is really action packed or you want to do slow motion there is no actual benefit but instead a deterioration when you shoot AVCHD progressive underwater.
Note: if instead we were shooting at higher bitrates for the 50p the story would be different but at similar bitrate it goes as above.
You will also have noticed stream 2 and 4 in the image above I repeat them again here
The second and fourth stream are generated by a Panasonic camera and they look different. You will notice now the existence of frames with the tag B and also that some of the P frames have a green slice.
This means that Panasonic AVCHD implementation has two features that Sony does not have:
1. It has B frames which not only predict future frames from the past frames but can also reference future frames in the prediction (sounds crazy but it works basically the frames are stored in memory before past ones are saved)
2. It has slices for images so on one frame there can be an element of prediction from a previous frame and another element completely newly generated for example if the prediction was completely in a part of picture where there was a lot of movement.
H264 encoding has motion compensation so things that do not change are referenced and new parts are predicted or in this case partially created from scratch.
So the Panasonic encoding algorithm is much superior to the Sony one for AVCHD this explains why a small camera like the Panasonic LX7 could produce video to compete with a larger sensor RX100 with almost double number of megapixels.
What makes me laugh is when photography magazines jump to conclusion on the video quality of a camera shooting a static frame!
Of course if there is not movement the camera with the best IQ in still pictures will prevail however when you record motion all of that becomes somewhat less relevant as compression impacts the quality.
So the more effective compression algorithm of Panasonic beats Sony to the point that even a larger sensor size seems not to matter.
This explains why when you take a real life clip Panasonic cameras perform better in video despite a worst image quality in still images.
The difference between the 28 Mbps and 24 Mbps follows pretty much the same trend of the Sony clips there is not enough bitrate to justify the double frame rate unless there is a lot of action in your clip.
So to conclude if you are shooting AVCHD the normal 24/25p more will have better image quality and will be more suitable to scenes with a lot of dynamic range, will give more colour and contrast. If there is really a lot of action or you want to slow down the clip shoot in 50p bearing in mind that image quality will actually drop if you look at a still frame in isolation.
Underwater contrary to what you may expect things do not actually go that fast and most of the movement is in a specific part of the frame or in a limited part of it so AVCHD 24/25p gives better results.
Finally when looking at a camera for video check for real clips do not look at resolution charts designed for still images as they give very little indications on the quality of your videos. Also if there are any tests make sure those are on the JPEG images that share similar processing engine not on RAW files are you are not shooting RAW video. And finally consider that at similar bitrate some manufacturer have a clear edge on others when it comes to real time compression in our example Panasonic produces similar quality to a Sony camera with overall a better sensor but poorer compression.
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
Snell’s window is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees [From Martin Edge: Underwater Photography].
During my last Gapapagos Trip there was a bit of an issue in terms of photography subjects, in essence most of them were fairly big like sharks, turtles, eagle rays and of course divers.
After a while shooting or trying to shoot those uncooperative models I had the idea to try and do different things such as silhouettes and Snell windows. You can also combine both as we did in this case.
So what do you need to shoot image of a Snell window:
1. A lens that is wide enough, you need a bit more than 96º field of view to take the whole window
2. Something interesting on the surface (if you have calm water you can see right through)
3. An interesting subject as silhouette to contrast the clear water if there are waves and you can’t easily see through.
A normal flat wet wide angle lens for our compact camera is not sufficient to capture the snell’s windows as in this example
Take into account that even with a fisheye lens on an SLR you can’t capture the Snell’s window on the vertical axis as the field of view will fall short a few degrees.
With a compact camera a semifisheye lens will capture the edges of the window if correctly aimed on the diagonal and horizontal dimensions and will fall short on the vertical.
I am reporting some of the calculated field of view for the most popular lenses at present for compact at 3:2 image format
All those lenses will take a good Snell’s window I have not tried the UWL-28 and I have some concerns this lens may flare as it usually does but I do not know for sure.
Both the Inon lenses produce sharp images with no defect.
In general small sensor cameras like the Canon S series will work fine with the fix/idas lenses and should produce good results also of normal shots through the water.
Using the UWL-04 or UWL-28 with large sensor cameras like the RX100 there could be a sharpness issue a larger apertures so make sure you close that at f/8 or smaller instead of using the shutter speed to balance exposure if you want to go through the water.
Snell’s windows are uncommon with compact camera shooters as they are considered an advanced subject but they can be taken. I will be taking more in a next trip to Egypt I hope for calm surface conditions so I can go through the surface with the shots. Failing that this is very easy to practice in a swimming pool.
In one of my first posts on this blog I covered the subject of setting white balance with the Sony RX100.
It may be useful to have a quick recap on the topic:
For pictures setting a custom white balance is not useful if you shoot in RAW as the amount of correction in post processing is far superior*
For video (that is shot in compressed format) setting the appropriate white balance for your shots is essential
There are exceptions to this rule, some people like to set custom white balance even in RAW when they shoot ambient light pictures. This is because changing the white balance shifts the histogram and therefore if you had taken a shot with an incorrect white balance you may retrieve wrong information from the histogram. Personally I do not do this most of the ambient light shots I judge by eye and not histogram or are silhouettes anyway but may be useful to know.
The other exception is when you shoot a raw video format with bit rates in excess of 100 Mbps, in that case the footage is captured in a bland format lacking any real depth and contrast and things are corrected in post processing. This does not apply to any consumer camera that works in AVCHD or Mp4 with bit rate lower than 50 Mbps in any case.
It follows that setting the appropriate white balance for our videos is something that is important otherwise our clips will look dull, green or have some sort of color cast we do not like.
As many of you RX100 I have experience with the infamous Custom White Balance 9900K error. In theory if you set your custom white balance with the camera in P mode over a neutral target this error should only occur if the color temperature is out of range (>9900K) unfortunately this is not the case and you get this error pretty much always with our beloved camera. At the beginning I thought that this was due to my cheap PADI slate, but after various attempts against my hand, sand, buddy’s tank, the sun I have to think there is some genuine issue here.
So I got myself whibal card, that on my test on land performs amazingly well with both the RX100 and the Nikon D7100.
The first thing we can realize is that the auto white balance setting is rather cool in outdoor scenes, whilst it tends to be warmer in indoor scenes with artificial light.
When you take a custom white balance the colors appear warmer and the bluish cast departs and the yellows come back.
This is particularly bad news if you shoot underwater without a filter and think of using auto white balance as those results will be pretty ugly.
The whibal card has a specific black mark that if illuminated tells you the white balance reading is incorrect because of reflections. I thought this was the key to the 9900 Error, unfortunately I was wrong.
It just fails 100% reliably really painful so I could not get rid of my trusted red filter for the Galapagos trip. I even tried setting the white balance with the filter and it would fail as well.
So I went back to auto white balance and red filter and I am pretty happy with the results, many people have asked me if I have manipulated the footage in post processing as the colors look very deep and some have even said unnatural. Even so shooting at 1/50 means a relatively low ISO and in the specific trip another f/stop of aperture was not really significant but I would have like to have the option of working without the filter, sadly this was not an option.
For what concerns white balance just a few things I want to say:
1. At depth there is no color anyway so what your eye can see it is not what it is, the proof is when you use lights or strobes things look much better than the naked eye. Using your visual as a reference can produce dull results.
2. You have to set an appropriate white balance for your scene, this means removing the cast. If a scene has no cast and the colors look saturated this is not a white balance issue on its own but may due to the camera settings. The RX100II is one of the less saturated camera on the market. The mark I instead is pretty saturated take this into account.
3. Footage that looks dull IS in fact ugly. The fact you set custom white balance with or without a filter does not mean that results is the perfect result, there is no such thing in fact and as colors disappear at depth white balance is not that effective anyway
Nick Hope sometime ago published some interesting tests on wetpixel
It turns out that there is more than meets the eye.
Just to clarify the only color correction in my Galapagos clip is:
1. In the scene of the dolphins I was pointing the camera upwards and did not have time to take the filter off so ended up with a red cast, I performed a white balance adjustment in iMovie on the opposite value of the tint I was getting until I liked it.
2. In the scene where there is a group of Galapagos sharks and the close up of the eagle ray I have reduced the blue gain as it was over saturated
In all other cases the only changes were increase of contrast or reduction of brightness. When the water was green like at the end in the Punta Vicente Roca scene I did not touch it to make it look artificially blue.
Again for those who ask I use a deeproof push on filter for the Inon UWL-H100 this filter is my preferred for the only reason that is actually the only one available on the market that fits on the lens. Personally I would much prefer a plastic filter like the ikelite/URPRO but this one is glass. It seems to correspond to a deep sunset 2700K with magenta tint of +5 on the RX100 but I have no tools to measure it I can only say it works.
So my recommendation for the RX100 is to get this solution as the Inon lens has the best optical quality and a hood that comes very handy to reduce flare. There are other lenses that fit the RX100 but have no hood. Obviously an not even considering the fisheye style lenses as distortion is ugly and placing a filter under the lens is a very bad idea.
After the various Backscatter, Bluewater photo, and other shops compact cameras reviews I thought of putting my 10 pence in as well.
Most of those reviews you find are written by people who shoot DSLR and then occasionally go and take a compact in water to see how it goes. For what concerns underwater use I only shoot compact and I believe I know how to navigate into features and limitations of compact camera quite well so here is my view on the subject.
The first hint when you look at a high-end compact camera is to check if Nauticam makes a housing for it. If not maybe your camera is not as good after all. There are some exceptions of course.
I have ranked compacts according to the following shooting categories:
Close Focus Wide Angle
All purpose cameras
When possible there will be a top 3 in each category.
I have considered only the following cameras
The Fuji X20 is a potential addition but I have not found anyone that actually shoots it underwater so I abstain from judging here.
Best Cameras for Movie
In order to score in this category the cameras need to have full manual exposure control in movie mode and be able to shoot double frame rates for the system of choice PAL or NTSC.
This is my appraisal:
Canon cameras do not offer exposure control in movie mode, Olympus video is pathetic. Not possible to even consider a number 3 here.
Best Cameras for Ambient Light
Here I consider shots without strobes with a view angle of 100º diagonal you need a wet wide-angle lens to take those shots.
Here are the rankings:
Olympus lags behind in image quality and the Canon G16 does not have any wet lens that allows to take those shots without strobes.
Best Cameras for Macro
I am looking here at shots are real 1:1 reproduction ratio and how easy is to take those shots in terms of autofocus and depth of field. In order to achieve this level of magnification a close up wet lens is necessary for all cameras. No compact camera achieves real macro with the bare port underwater.
Here are the results:
The Canon G16 in virtue of a 140mm focal length at telephoto end gives the highest magnification ratio, the Canon S120 follows closely same image quality less magnification. The Panasonic LX7 has only a 90mm equivalent lens however the autofocus is incredible so you can use +10 diopters very easily and it is the only camera to really offer Bokeh.
The Olympus XZ-2 lags in terms of image quality, the RX100II has great image quality but little magnification, you need a +10 diopter to give a 1:1 reproduction ratio and focus is difficult because of shallow depth of field due to the large sensor.
Best Cameras for Portraits
Here we are considering shots with the bare port at 35mm focal length using strobes. Here is the ranking:
Canon S120 & Canon G16
Whilst the RX100II has the best image quality it comes a bit as a surprise why the LX7 gives better images than the Canon. The reason is that Canon tend to have a very unbalanced color range with over saturated red. This does not go away with RAW images as it affects the whole spectrum. It is possible to correct this using blue diffusers for strobe but this is just a patch, the LX7 tend to give much better balanced images.
Best Cameras for CFWA
Close focus wide-angle is shot with a fisheye like lens, using strobes typically at small apertures here are the rankings:
It is quite clear that the RX100II with the widest choice of fisheye lens and the highest dynamic range is the best camera for the job, but the addition of the Inon Zoom lens helps getting the G16 in this category, the S120 follows with similar results. The LX7 does not offer a fisheye options sadly and the XZ-2 lags behind in image quality compared to the two canons.
Best Versatile Still Cameras
Here I look at cameras that can shoot all type of shots from macro to ambient light.
The lack of fisheye options cuts out the LX7 and the poor performance of zoom wide-angle lens at wide end kicks the G16 out.
Best Overall Camera Still and Movie
Taking the previous list and eliminating the cameras that do not offer exposure control in movie mode this is the result
So the Sony RX100II is the only real all round camera and this explains why it beats the other in terms of sales.
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.