Hey Pete - apologies, for some reason I did not receive the alert to your 2016 reply!
Some of my reponse may be a bit "after the fact"!
Did a few shoots with the RX100 MK5 in a Nauticam housing. Unable to compare with the AX100 or AX700 - but hopefully what I can share helps a few people decide.
First - a few good points (we are happy with the system overall) The housing is compact, and with the Nauticam grip/tray pretty ergonomic. The footage looks great - ended up as main camera for a 30 minute TV episode of kids swimming down a river gorge. AF awesome for video - but prob similar to AX100 etc. Nice slowmo.
Used Nauticam WWL-1 wet lens giving 130 degree wide, which is awesome underwater. Stacked +10 wet lenses for macro give >1:1 - of you can get the cam close enough and steady!
The not-so-good probably more useful to others:
- WB still a challenge. Need to execute a manual WB in photo mode, and even then it was waay off.
I tried a Magic Filter (Auto-Magic) gel pressed on inside of the port, then camera in auto.
Results were a mixed bag as expected, often giving me weird orange hues.
I really missed a flip in red filter as you would have in a Gates video housing.
- The Nauticam viewfinder was a bear to use. In 4k mode, it dims, so not visible near surface (or eg when I did the river gorge shoot). The Nauticam LCD magnifier/cover helped, but only when at eye level. Here the Gates system loosk way better for UW use.
- Balance on the housing tricky once you have tall light arms attached - keeps tipping vertically.
- Battery life too short - I have to swop out battery every dive, which means opening housing etc.
- Overheats when filming in 4k - even underwater. Not so much an issue if you're just grabbing shots here and there - but a real problem if you're filming events unfolding - or building a sequence of people doing their thing.
- Stabilisation is ok, but only active mode really cuts it when not filming wide. Unfortunately active is only available in HD.
- Did I mention the 1inch working distance that a 70mm lens gives with a +10 diopter?
Anyhow - overall the system met our needs for a while, but I am not sure I would go the same route again for serious UW work. All the niggles genuinely add up.
+1 for Resolve to get the best out of colours in post!
Edited by reanvdm, 01 October 2018 - 01:32 AM.