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Message: <blockquote data-quote="kluisi" data-source="post: 266929" data-attributes="member: 17548"><p>You're not asking about the quality of the Sigma, right? I think you're saying that a Nikon DX lens has the crop factor already figured into the focal length markings and I do not think that is true. A DX lens marked 18-55mm will look the same as an 18-55mm FX lens on a DX body (they will both look like an 27-82.5mm lens) as the lens itself still has the focal length 18-55mm. The only difference is the view on the sensor. The difference between buying an 18-55 DX lens vs an 18-55 FX lens, is that the DX lens will not be usable if you upgrade to an FX body as Vignetting will be terrible in most cases (except in crop mode where the FX crops your view to simulate being a DX body anyway, which lowers the resolution of your images by about 40%).</p></blockquote><p></p>