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How much would this put you off of this lens? Im considering it and the sigma, honestly I dont know how often this would pop up. One of the reasons im looking at both of these lenses is for low light photography. Reading the reviews on this site the coma issue of one of them made me curious and eventually I found that image on flickr, it really would make astrophotography kind of a bummer with the lens.
I really like the canon's size and weight over the sigma, then again the sigma does have one more stop, and probably better overall iq. The qc issues of the sigma dont really mean much to me. Id be lying if I said the IS wasnt an interesting factor for lowlight stuff but then again if lights distort so much it kind of defeats the purpose. The few test shots posted here Ive generally liked, but I cant get over the coma now. Mountain out of a molehill?