Chris Ross

If you look at the colour spaces Macs use DCI-P3 which is a little smaller than Adobe RGB and is extended in reds/yellows more so than blues/green that Adobe RGB covers better. This diagram shows the coverage of various colour spaces:

I agree in principle, One thing that seems apparent there are quite a few flavours of TTL among different strobes, you just have to look at the UWT triggers which have multiple different settings for all the different strobes and a different trigger model for each camera brand. I believe the timings are different with each type of TTL and I suspect this is a reason TTL is regarded as unreliable underwater as up until recently a universal slave TTL was all that was available. I heard somewhere that Olympus RC is open source so it does not need reverse engineering to make it work so in principle UW strobes that work with RC mode will work as well as any Olympus strobe on land when shooting TTL. It was also specifically setup to send TTL commands optically. This is probably the reason it might work a little better.

No problem, they are nice to work with - right! One thing to remember, if you are posting these, browser are mostly default colour managed now, however they will assume your image is sRGB unless it is tagged otherwise, You do need to keep the colour profile in the file, there is generally a check box to include the colour profile in the file when you save. Unfortunately you need the good monitor to see the benefit, Apple users will be close, but if they are being viewed by photography enthusiasts they are more likely to have a good monitor.

You can get very close with it, it compresses the range that will focus quite a bit, I haven't tested the limits of it at the short end, but the port chart says it will focus from 0-1500mm and get to 0.8x implying it will focus from the glass out to 1.5m away. If I need to get super close, it seems the best solution is often to remove the MFO3 and use the bare lens as you will get more magnification and working distance. The exception would be murky water with particles and you want to get closer to reduce backscatter.

Guide numbers can be quite misleading, A lot depends on how the light is distributed in the beam. Quite a few strobe tests have been posted on here in the last couple of years, it's probably about the best comparison you could find. Assume you've looked at the pinned strobe comparison table in this forum, the spreadsheet linked has larger images.

There have been some threads discussing this, I recall there is a quality uplift, but don't recall how dramatic.

sorry no, best to DM I think, you could try looking through his posts you might see something there?

I would expect that the TTL of the maxi would use the same protocols as other recent Retra strobes. I found this reference to TTL performance of a 4th generation Retra here:

In principle the way to do this is fairly easy, you just need to work out the right extension. I see the Seacam port chart mentions that is using a converted lens with Metabones to use to the PVL25 extension and that the zoom ring is a special. To that you would need to add extension equivalent to the thickness of the converter in question. Presumably you use the recommended Canon extension with the PVL 25, but you would need to confirm that with Seacam and also ask them if they can help you with a zoom ring, otherwise you would need to have one printed. I would also add that the compact dome or one of the fisheye ports would be more flexible for this setup if you want to do CFWA as you can get quite a bit closer.

Thanks for this, though possibly better 18650 batteries may now be available? I suspect you method has some validity, if the strobe has more power in your test it probably is also brighter in comparison for a quick burst, but I guess it depends on how the strobe is programmed to deal with continuous shots. In addition using 3 18650 (assuming) in series, the voltage is higher so less demanding on amp draw.

edge at the moment, it's a work machine, usually use firefox on home machine, won't be home for a few days yet. I can post some examples. Edge claims to be fully colour managed. checking on this page confirms fully colour managed: Is your system ICC Version 4 ready?

Facebook applies its own profile to save storage space. This forum also does some things to images including stripping metadata and for some reason images I upload from my Win 10 desktop have the life sucked out of them , while images I upload from my win11 laptop look a lot better. I can see very little difference between the two in these examples, which could be due to what the forum software does to the images?

You could get a microsoft surface pro, they are close to a tablet in size, even with the keyboard cover, then you have a full featured system and can use regular applications to do your sorting and keywording.

Perhaps, but many more people can see Adobe RGB these days, I-phone and Macbooks can display DCI-P3 which gets around 90% of Adobe RGB and many laptops have similar capabilities these days if they are not base models. Even my fairly basic Yoga 7 covers DCI-P3 and extends towards covering Adobe RGB.

Ikelite recommend it to be used with a fisheye and the specifically for CFWA, the lens needs to be up in the dome to not vignette and the entrance pupil is right up front. So for that and many wide angle lenses it will vignette if you attempt to place the EP at the centre of curvature. The sample pics provided look OK but they 1024 x 1024 images so at lets partly cropped and a little small to judge critical sharpness but they certainly look OK on the website at that size.