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Hi all, I've recently just upgraded to a Nikon D800 with Nauticam housing. I've only done a few dives with the new rig so far, unfortunately in pretty terrible viz, but have noticed a couple of issues with my wide-angle set-ups: - Nikon 17-35mm, & Nauticam 9" optical glass dome & 70mm ext ring. - corner sharpness is quite poor. - Tokina 10-17mm & Kenko 1.4x teleconverter, with Nauticam mini dome (for the 10-17) & 20mm ext ring - slight vignetting visible at its widest focal length. Is anyone using the same lenses as me but with different dome ports? how do you like the results? Is anyone using a Nikon 16mm fisheye on a D800? How does it compare to a 10-17 with a 1.4xTC? The 2 images attached: Nikon 17-35mm, Nauticam 9" optical glass dome & 70mm ext ring, 17mm, 1/200s, f9, ISO160, natural light. (The 2nd image shows the blur in the bottom-left corner of the 1st image). My general question to any D800 users (ideally, Nauticam users too) is, which wide-angle set-up do you find gives you the best results in terms of corner sharpness? Any advice is much appreciated, Cheers, Christian note to Alex Mustard: i read in a previous D800 post last year you may have written a piece discussing wide-angle lenses and domes for FX cameras? If you have, i'd love to have a read as i'm sure you have the magic answers! thanks.