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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 140190" data-attributes="member: 13090">The DX crop factor is 1.5 "magnification" basically speaking. On your D5100's 18-55mm you have to multiply by this factor at all focal lengths. So what you have, effectively, in your 18-55mm lens is a 27-83mm lens. To get the 50mm perspective you want you'll need to set your focal length to just under 35mm since 35 x 1.5 = 52.6.And just to clarify, before someone jumps all over me, the DX crop factor gives the appearance of a magnification but it's not *really* a magnification per se, it is in fact, a crop when compared to the full size FX sensor; hence the quote marks.</blockquote>