I’m a long time user of a Nauticam flip holder for a single wet diopter. Usually starting a macro trip with a +5 SubSee before switching to an SMC-1.
The discussions about the MFO-3 make it sound like a great lens to have around when geared for macro (Nikon 105VR).
I learned a long time ago that trying to screw lenses on and off underwater was NOT a task I favored.
A double flip looks super bulky, appears to add a lot of front weight, is a bit $$$, and the length of the MFO-3 doesn't seem very amenable to a flip holder.
I have reason to move to a Nauticam bayonet mounting system for other reasons.
But - The pricey arm holders for extra lenses on bayonet look like they again add a lot of front loaded weight & bulk.
I do have a large front velcro pocket on the waistband of my backplate/wing as an option to store the lenses when not in use.

What are folks’ experiences with wet swapping lenses using the bayonet system from Nauticam?
How do other folks carry around the various lenses for macro shooting while on a dive? 

I'm using a bayonet holder for my MFO3, I'm on m43 so the magnification of the 60mm macro lens is sufficient and I don't use a diopter. So only taking the MFO3 on and off and not needing to park a diopter.

Swapping them is fairly easy, the MFO3 is a heavy lump above water, but doesn't give me problems below water. I also used cargo shorts when diving in Lembeh, I only needed to fall off the boat so no issues with them falling down, not an option shore diving in Sydney where I use the bayonet. The bayonet holder is mounted on a strobe arm, when I'm entering/exiting the water I have the neoprene bag it is supplied with covering the lens. Getting washed into the rocks exiting is a common enough occurrence that some protection is needed. Once UW I remove and clip off the bag.

I currently use an AOI double flip holder for my diopters (CMC-1, AOI +6 mostly), and plan to use it with MFO3 when I make the jump to a rig with the Sony 100mm macro. The other flip holder will holder either a MFO1 or the AOI 12.5 (which is similar to the SMC1)
The dual flip is bulky but really convenient. And if you ever get into blackwater divin, bayonet or not you don't really want to be handling lenses in the dark over deep water if possible.

As a caveat, if you ever consider the cheaper AOI flip, make sure you get the small spacer adapter for Nauticam lenses (not the one which comes with the lenses, it's too large and doesn't fit), as these diopters cannot be used as is because of the protruding lens design, which is too long for the AOI holder and means the lens rear hits the port glass.

Edited Sunday at 11:12 AM3 days by bghazzal

Been a bayonet fan for years with a caddy on a strobe arm, as well as mounting a small stub arm off the right post with a triple clamp next to strobe arm. Diving cold water with thick dry gloves has never been a problem swapping between CMC1 and WWL-1B. However, after getting a MFO-3 to use with the 90mm macro, for whatever reason, I found the bayonet a bit clunky and got a single flip holder, which I find works great for quickly adding/removing the MFO-3. Now I'm looking at an MFO-1 and will probably be back to bayonet with two lenses rather than a 2-lens flip holder ($$$$).

I am shooting an R7 in a Nauticam housing. I bought the MFO-3 which I love! I initially thought about at the Nauticam dual flip but was worried it would interfere with my strobe position. So I just put the MFO-3 in my pocket shorts. Last week I was able to borrow a Nauticam dual flip and was very happy with it. It is so fast to flip on the MFO-3 and I found the balance was not greatly affected and I could work around strobe positions. When I had the MFO-3 in my pocket, there were times I was hesitant to screw it on but with the flip, it was a joy to use. I am sold on the dual flip!

I love my dual flip holder.

1 hour ago, SwiftFF5 said:

I love my dual flip holder.

Same. I use the Nauticam Dual Flip with a couple of setup.

• MFO-1 + SubSee +10

• MFO-1 + Kraken KRL-09s

The Kraken wet wide adapter is quite large, probably bigger than an MFO-3. I don't have any issues using it deployed or folded with my strobe positioning.

I have been using the Marelux single flip adapter with both SMC-1 and Marelux Macrovie +5, +10 & +15 C/U lenses for two years now. Both NA & MX mount the same with the lens protruding a bit in the rear of the holder rather than flat. Single flip is $259.00 and the dual is $299.00 and both come with the installation tool.

Edited 1 hour ago1 hr by Phil Rudin