I am in need of a good quality museum lens for my D80. I have fast lenses (35 f/2 - 50 f/1.8) and I have wide lenses (Sigma 10-20, Nikon 18-70) but I do not have both qualities in one (except the 10.5 fisheye but it is a specialty lens). Museums do not generally allow flash and tripods/monopods so I need fast and wide. I am considering (under budget constraints < $500) the Sigma 28mm f/1.8 $300, the Nikon 28mm f/2.8 $245, and Nikon 24mm f/2.8 $310, also 52mm 0.58lb I do not know if there are others I should consider. The Sigma 30mm f/1.4 looks good but it is too close to my 35mm and not wide enough. The disadvantage of the Sigma 28mm is that it is bigger and 77mm (though I do have 77mm filters) and 1lb. The Nikon 28mm is unobtrusive for a museum with a dia. of 52mm. and light at 0.43lb I don't think going wider than 24mm and accepting the distortion is wise, but I may be wrong. Any other lens I missed? (zooms might be OK if the price is under $500). Any opinions on these and their quality? Recommendations?