I recently bought a Canon 15mm fisheye to use on my 5D, Subal housing with FE2dome. Some test shots @ iso200, 1/100th @ F9 seem to show a touch of artifacting. It's not bad, but it is there. And the image in question was shot without flash. Has anyone had similar problems with this lens? I've attached a very small preview of the full image + a crop of the nearsest shark.
Also, any suggestions for optimum aperture for this lens with the port I'm using.
Any advise will be very welcome.
thanks
Carol
