Hi,
I've taken delivery of a few units. I haven't dove them yet as my schedule (and leaky drysuit zipper) prevents me from doing so. My initial impressions are:
1) Mounting on the Aquatica macro port is very secure and the 3 locking screws provide a secure fit and they don't scratch the port
2) The quick mounting system is locks the diopter tightly to the mount. Not quite as solid as say a bayonet but still locks in there. The 67mm threads also allow for ports with M67 mounts.
3) Same magnification as the Subsee
Just for laughs, I tried to see how close I could get with the +10. Click here and scroll down. There is some motion smearing and shallow DOF, but IQ is very good compared to bare EF100f2.8 Macro, and working distance from the end of the diopter was about 1.5-2" to get that much magnification.
Stewart
and if someone compare it with the subsee ?