The movie Fargo has a hilarious scene in which involves a certain disabled person and his pants. I’ve got to keep that in mind when shooting the Nikon 10.5mm DX (2/3 frame) on the full-frame Nikon D3, which can easily record whether or not...well, you get the picture! Not wishing to incriminate myself, I’ll just show this picture instead.
Nikon D3 with 10.5mm f/2.8 DX (full frame)
The 10.5mm DX is designed to cover a 2/3-frame sensor camera like the Nikon D200, D40/x, etc. On a full frame camera, the lens shade intrudes into the frame. Bjorn Rorslett (naturfotograf.com) reports having sawed off the lens shade and finding that the resulting (unsaleable) lens can actually see behind itself (about 200°). Now where’s that hacksaw...!
So—you can either spend US$5000 or so on a superb (but huge and heavy) 7.45mm fisheye from Coastal Optics (see Nov 8 entry), or you can get a diminutive Nikon 10.5/2.8 DX and saw off the lens shade for a most-of-the-frame image.