Sigma 10-20mm fisheye dome for Nikon

[Jproc]

Sea and Sea,
I have the DX-D80 housing and NX fisheye dome. I'll be using a Sigma 10-20mm in the dome. I've been told it will work with an extension (maybe 40?), but the system chart does not show this combo as compatible. Any suggestions?
Thanks!
Jason

 

[Mariozi]

Jason,

As I told you on the WetPixel board:
Whatever can be used on the Optical Dome Port or NX Compact Dome Port also CAN be used on the NX Fisheye Dome.
I have used this lens, and it performs a lot better with the ER40.
The frontal node of the lens is better aligned with the center of the dome this way.
The only problem I see with the NX Fisheye Dome is that you cannot get as close to subects as you can with the smaller domes, but the big one is definitely better for half-half images (over-unders).