I have used both flip adapters and bayonet mounts. My WWL-1 was on a bayonet mount, so my macro diopter also had to be on a bayonet mount. Previously, on my old system, I had the macro diopter on a flip mount. As soon as I sold the WWL-1, I bought a dual flip mount for my (now) two macro diopters. While the bayonet mount does work well, I was constantly worried about dropping one or the other of these expensive lenses while changing them. The flip mount eliminates that worry. You do need to be careful about positioning so that it doesn't interfere with your lights, or setting up your photo but it does give me peace of mind and one less thing to worry about while task loading with everything else connected to underwater videography. Just my opinion.