Thanks for the advice! What kind of housing do you have? Do you know anything about the 140mm nauticam glass dome that fits the 8mm?
The Panasonic 8mm fisheye behind the Nauticam 140mm glass dome does slightly vignette, as indicated in the Nauticam port chart. I have the Olympus em1-mkii. Because vignetting only happens on certain shots I think it has to do with the in-body image stabilization. I noticed it was more visible when I moved the camera around quickly. Like in the un-cropped example below when I quickly looked up to and saw this pup with it's mouth open.
I recently upgraded to the Olympus 8mm Pro fisheye and added the 17mm extension ring. Based on only a few test shots in my living room, the only time that the dome shade was visible was when I very rapidly swing the camera up or down when taking the shot. It is much less visible than with the Panasonic 8mm. 2017-11-25 La Paz-5.JPG 183.52KB 13 downloads