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I'm whiplashed that you like larger sensors and iPhones in the same thread....Pyndle,
Search for posts under my name......I've gone from film Nikonos to housed film SLR to housed digital SLR to smaller digital SLR (Canon SL1, Ikelite housing similar to your Sony APS-C rig) to now two choices that have eased my travel, set up, maintenance before and on site and after. Plus a huge travel downsizing......
The 1" sensor compact choices from Sony (RX100 VA or for more versatility on the surface RX100 VII) and Canon G7X II or G7X III are both great choices.
Small for travel, less expensive (Canon less $$$$ than the high end Sony) allow switching from macro to wide angle all on the same dive. The Canon has pretty darn good built in macro and the larger than Olympus TG-6 sensor can produce great sized prints.
Like you have I tired of hauling extra batteries, chargers, etc. and coined my theory "the elimination protocol" meaning any time I can eliminate o-rings, batteries, extra doodads my dive travel life becomes simplified and more enjoyable.
I'll confess to having 20+ years of underwater photos on my computer(s) from Whale Sharks to dolphins plus every colorful fish and nudibranch, reef scenics, etc. What I want to maybe take a picture of is what I'll term "different".......A new perspective, Black and White scenics, maybe a fish face at a new angle, etc.
With my Canon 1" sensor compact I pop on a wide angle "Air Lens". When I had the Sony RX100 VII I used 67mm glass Inon lens. My housing's flash diffuser for using the camera's built in flash or a semi-powerful LED light 1000 - 3500 lumens is fine for closer than 1.5' as a close up shooting option.
On my upcoming trip to Raja Ampat this fall I'll take my remaining Canon G7X II, Fantasea housing, F Series pop on "Air Lens" (that restores my native 24mm focal length) plus maybe one single small flash - an Inon S2000 or new S220 if it comes out by then.
I've dived with a single Inon S2000 flash on my housing's cold shoe mount and got pics I'm happy with. Inon has a fancy little quick disconnect mount I might add to hand hold the strobe playing with lighting.
I may take a super lightweight little tray I have in my dive locker with lightweight FLEX style arm which are MUCH lighter than ball joint and clamps.
The other thing I use these days is the wonderful DiveVolk touchscreen housing for my iPhone 13 PRO Max. Truly a game changer and I've had people who worry purchase a 2nd phone to use strictly as an underwater camera.
You only really need a "standard" iPhone 12 / 13 / or 14 with the 1X and .5X two lenses underwater. iPhone 13 and 14 models even have incredible macro capability built in. They see in incredibly low light.
Using a 1000 lumen flash light I shot photos of BSA / Norton motorcycles in the hold of the famous Thistlegorm wreck in the Red Sea last August that rivaled people using huge housing set ups.
Being "in the UW photo industry" over 35 years I'm sad to see too many people pushed into the "bigger is better" mind set. After a few trips hauling it all, maintaining it all, etc. they're overwhelmed and not having fun
Poke around and you may find something like a compact or iPhone housing is all you need these days
Just one old guy's opinion!
David Haas
PS - Here's some photos taken with my previous iPhone XR in Maldives
View attachment 785678View attachment 785679View attachment 785680View attachment 785681View attachment 785682
I just noticed that the attached videos' quality has been seriously degraded maybe by google drive.Here are 2 small unedited clips to get an idea of what you can get (see them in full screen):
and
Few years ago I have flooded my camera during the first week of a 2wk trip. One of my fellow divers gave me their backup TG, I think it was 4 or 5, I installed it to my dual flash setup and happily snapped around. On small display photos looked ok but back home, when I view them with large display, it was totally different story..Just get a TG6. Seriously!