Wet diopters

I was in Komodo recently and was unable to get good frame-filling shots of xeno crabs and other small critters with my Sony A1u in an Amphibico housing with the standard port.

The options for wet diopters seem to be the MacroMate and the SubSee.

Does anyone have experience with either of these? SubSee makes an adapter specifically for the Amphibico but Backscatter says they can custom make an adapter for the MarcoMate.

Thanks, Will

Will, I use the Macro Mate in conjunction with a Canon 100mm macro for stills but have never used with video. There is a paper thin focal range. I love it and would highly recommend due to the high quality build from Backscatter. Here's a sample shot face-to-face with a fireworm.