If this helps anyone, I just received an AOI AD-M67-04 double flip.

Well designed, but some things to be wary of:

I use a Nauticam CMC-1, which is a fairly common diopter.
The AOI's design means that the back-protuding part of the Nauticam lens sits too deep in the mount, it creates a gap and it is not possible to lock it.
And it's not possible to use the Nauticam 67mm adapter, as it is too big to screw into the flip (doesn't fit because of the hinge.)

CMC-1 protruding:



Meaning you need to either not screw the CMC1 diopter in fully, which means it rattles and can unscrew (but then you can lock), or screw it in fully and not lock it (which leaves a gap)

However, I found a workaround, by adding an o-ring around the CMC1's thread, which restricts how deep it goes in the mount - now I can screw it in fully (to the o-ring), and lock it.

The other thing to look out for is the bright aluminium ring which holds the mount in place.

This is fine when the diopters are in use, but could cause reflection issues if not using any diopters (so a little black pain or tape might be required).

Otherwise as expected, adding 600g to the short port destroyed my camera's trim, making it super nose heavy, but I managed to make some adjustments which need to be tested in the field.

Hope this helps

Edited Saturday at 11:28 AM2 days by bghazzal

Which Nauticam m67 adapter did you try? Looking at the 81228 on my CMC-1, it doesn't look like it extends further than the rim on the CMC-1 itself. Maybe I misunderstand the problem. I ask because I am considering a dual flip adapter for my 120mm front diameter macro port.

I had had an inexpensive flip adapter I bought off AliExpress. It worked great until it didn't. Then, I decided I wanted to be able to switch between my MFO-1 and Fantasea/AOI +6. Got the SAGA dual flip adapter. The lenses fit well, but I returned it before using it. It just seemed too bulky and cumbersome. Instead, I'll use the Fantasea/AOI bayonet mounts like I already use for my AOI UWL-09 PRO WACL.

Edited Saturday at 02:52 PM2 days by Babydiver

16 hours ago, d2b said:

Which Nauticam m67 adapter did you try? Looking at the 81228 on my CMC-1, it doesn't look like it extends further than the rim on the CMC-1 itself. Maybe I misunderstand the problem. I ask because I am considering a dual flip adapter for my 120mm front diameter macro port.

Basically the CMC-1 and CMC-2 comes with a 67mm adapter (Nauticam), to use it directly on any 67mm port - you remove it to use the lens on a flip mount - this adapter doesn't fit on the AOI flip adapter (it's too big, so the adapter's locking mechanism gets in the way (it hits the adapter's dented thing), and you can't screw it on the flip.

Meaning you can only use the diopter without it (which is normal, this is the way you're supposed to mount it on the Nauticam flips),

However, without it, the CMC1's lens end extends to far from the flip holder, as seen in the picture, meaning you can't close the flip and there is a gap.
The solutions is not to screw it in fully, or rather to put an o-ring on the tread so you can screw it in but it doesn't extend as much, then you can close the flip and not have a gap.

Edited Sunday at 04:21 AM2 days by bghazzal

16 hours ago, d2b said:

Which Nauticam m67 adapter did you try? Looking at the 81228 on my CMC-1, it doesn't look like it extends further than the rim on the CMC-1 itself. Maybe I misunderstand the problem. I ask because I am considering a dual flip adapter for my 120mm front diameter macro port.

Basically the CMC-1 and CMC-2 comes with a 67mm adapter (Nauticam), to use it directly on any 67mm port - you remove it to use the lens on a flip mount - this adapter doesn't fit on the AOI flip adapter (it's too big, so the adapter's locking mechanism gets in the way.
Meaning you can only use the diopter without it (which is normal, this is the way you're supposed to mount it on the Nauticam flips),

However, without it, the CMC1's lens end extends to far from the flip holder, as seen in the picture, meaning you can't close the flip and there is a gap.
The solutions is not to screw it in fully, or rather to put an o-ring on the tread so you can screw it in but it doesn't extend as much, then you can close the flip and not have a gap.

15 hours ago, Babydiver said:

I had had an inexpensive flip adapter I bought off AliExpress. It worked great until it didn't. Then, I decided I wanted to be able to switch between my MFO-1 and Fantasea/AOI +6. Got the SAGA dual flip adapter. The lenses fit well, but I returned it before using it. It just seemed too bulky and cumbersome. Instead, I'll use the Fantasea/AOI bayonet mounts like I already use for my AOI UWL-09 PRO WACL.

Other than this CMC-1 issue, the AOI is really nice. I use it with the same lens, Fantasea/AOI +6 and it's perfect. Vignetting is pretty much the same as without the flip adapter.
But it is 300g or so, plus the weight of two lenses, so this is something to take into account for rig balance/trim

7 hours ago, bghazzal said:

Basically the CMC-1 and CMC-2 comes with a 67mm adapter (Nauticam), to use it directly on any 67mm port - you remove it to use the lens on a flip mount - this adapter doesn't fit on the AOI flip adapter (it's too big, so the adapter's locking mechanism gets in the way.
Meaning you can only use the diopter without it (which is normal, this is the way you're supposed to mount it on the Nauticam flips),

Sorry, I mis-typed the part number (which is pretty bad because the plastic package is sitting on my desk). The actual smaller Nauticam spacer ring is 81222. I got it in order to have a compromise between no spacer and the big spacer that comes with the CMC-1. The 81222 is smaller in outside diameter and in the amount it moves the lens back, so maybe worth a look.

1 hour ago, d2b said:

Sorry, I mis-typed the part number (which is pretty bad because the plastic package is sitting on my desk). The actual smaller Nauticam spacer ring is 81222. I got it in order to have a compromise between no spacer and the big spacer that comes with the CMC-1. The 81222 is smaller in outside diameter and in the amount it moves the lens back, so maybe worth a look.

I see, thanks - but it's fine with a o-ring on the thread - the adapter almost works with the CMC-1 as it's intended do, the only issue is the it sticks a a little blocking the locking mechanism and creating a gap. The AOI adapter is just a few mm too shallow for the CMC-1.

An o-ring on the mounting thread as posted solves the issue - you can screw the CMC-1 seecurely down to the o-ring, and no need for a spacer ring.
This solution is better because it reduces vignetting. I vignette to 45mm with the CMC-1 with the big spacer ring onto the port, but am down to 36mm with the CMC-1 mounted direct to the adapter with the o-ring.