Didn't find a diopter, but ended up leaving the shop with a Tokina 10-17mm Fisheye instead!
Rai - you said your friend was using his Tokina on a S&S D200 housing and Athena dome without any extension, right? This is how it looks on mine w/o any extension. Lens looks pretty far into the dome. Maybe a small extension might be better. 40mm ext I have is too long as there is vignetting from the dome itself (even with the shade removed).
Edit: just noticed on the Athena site that the Nikkor 10.5 FE is recommended to be used w/o any extension and the Athena dome. The Tokina FE is just a 1/4" longer so maybe I don't need an extension . Will try to test it out if I can get some pool time soon.
and just a quick street shot on the way back from the store... Interesting lens...
Edited by pakman, 06 January 2007 - 04:48 AM.