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Comments about Sigma Sigma 8 - 16mm f/4.5-5.6 DC HSM AutoFocus Wide Angle Zoom Lens for Maxxum & Sony Alpha Digital SLR's:
This is the widest non-fisheye on the market as far as I know, and am very pleased with it. At the 8mm setting, one expects to find some aberrations, but closing down one or two f/stops takes care of them. Very sharp, as far as I can tell.