maelstrom

I cannot recall the specific oring now, but the information is readily available on Reef Photo's web site.  The Nauticam port orings are much thicker.  I would not even consider using one.  E_Viking may have solved this problem.  if you turn it fully counter clockwise, it locks again.  Backing off just a little frees it up.  I was not quite sure what he meant, but stopped in Ocean Optical, and Jack Connick showed me in Person.  Many Thanks.

 

Hal

I ordered the correct o ring, which is actually made by Sea&Sea, not Nauticam.  Thank you for your suggestions.

 

Hal

The 10-17mm is too wide for sharks, but a wonderful lens.  My shark lens is a 17-55 Nikonf2.8.  You might get by with a 1.4 tele-extender for the 10-17.  I have the 100mm Zen minidome.  It is made for the Tokina 10-17, and works great with it, but probably will not work well with other lenses.  For macro, you will need something like 60mm, and a flat port. 

 

Hal

Incredible footage. They are just like house pets. I have the exact same system. When the subject changes distance you have to keep refocussing with the 7D. Compared to a camcorder that always keeps your subject in focus, I find it to be very frustrating.

Hal

Fantastic shots. Were you using a rebreather?