which extension ring for Wide dome?

[tiburontucson]

Shooting Nikon D70 with D70 housing. With Nikon 105mm Macro (NOT VR), I use the your 40mm extension ring and custom flat port. Do I need/use this same extension ring to shoot the Tokina 12-24mm with your wide dome? Any diopters required? I might add that I'm more interested in shooting sharks and turtles and mantas off in a distance, not CFWA. I also own the Nikon 18-70mm (kit) lens, can I use this lens behind this dome (if yes, with which diopter)? I realize I won't be able to zoom w/o zoom gear, but that's OK. Thanks in advance.

 

[SEA&SEA]

HI-
Unfortunately SEA&SEA Japan has not tested this lens, however, we have found that the Tokina 12-24 can be used with the Extension Ring 40 and Dome Port 240 (or Fisheye Dome Port). SEA&SEA does not offer a zoom gear for this lens, however, a SEA&SEA dealer offers a custom solution.