I've done eight dives with OS version on my Canon 7D and I like it a lot. It is much longer, heavier and the auto focus is a little slower than my Canon 100 .macro. The minimum focus distance is only approximately 40mm/1.6in more than the Canon 100. Shooting super macro with a Subsee +5 yields around the same 2:1 that I get with the Subsee +10 on my 100 macro but with double the working distance, so it is much easier to use for this type of photography. Using a Subsee +10 on the 150 will get you around 3:1 magnification but is an exercise in frustration as this is very difficult to achieve unless you are shooting in very still water and have the camera held very steady. I find it is a great lens for small fish that don't like you getting too close and it will be my go to lens for dedicated super macro photography.