Does anyone have experience to report with Onderwaterhuis.NL Flip Adapters? I am in particular interested in [1] to mount a Nauticam CMC-1 and a weaker Inon diopter on. I am currently using a howshot swing adapter [2], but I'm thinking this will introduce more distance between the front of the port and the CMC-1

than is ideal. It's also only a single lens holder. Other suggestions that would work on the 120mm diameter Olympus flat port welcome. I think the AOI [3] is probably an option, although its more expensive.

[1] https://www.uwcamerastore.com/onderwaterhuis-nl-flip-adapter-pro-duo-67mm-for-olympus-pen

[2] https://www.divervision.com/collections/wet-lens-mounts-and-holders/products/howshot-m67-mount-base-120p-for-olympus-ppo-ep01-flat-port-rm67-120p

[3] https://www.uwcamerastore.com/aoi-m67-flip-adapter-for-olympus-ppo-ep-01-ports

I use a flip adapter from onderwaterhuis for my subal housing. I often use it with the double flip (smc and mfo)

They are 3d printed, the ring that the lens screws in is aluminium and I believe it is glued in to the printed part.

I use it for at least 5 years now, it works nice. Once fitted on the port it feels sturdy, For travel I take it off the port and store it in a little box, as it does not feel too strong on its own.

the part where the 2 halves are screwed together on the port, is the least good part. When you over tighten the screw, the 3d printed plastic can snap. I use a little stainless steel bolt, washer and nut as mine snapped a few years ago. This sollution works very well.

This flip (at least the one for the subal), allows the screwed in lens to be flipped allmost onto the port, when using longer macro ports. This is really nice, as it doesnt make the housing very nose heavy and allows for strobe positioning pretty close to the port.

I attached a photo, only 1 flip installed at the moment for local diving.

Hope this helps.