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Message: <blockquote data-quote="PhotoAV8R" data-source="post: 168499" data-attributes="member: 939">Re: crop sensor body (e.g., D90) and FX or DX lenses.AIUI, it doesn't matter what type of lens is put on a crop sensor body, the crop factor will still apply. i.e., a 300 mm lens (whether FX or DX) will have the reach of a 450 mm lens. However, if one puts any 300 mm lens on a full frame body, one gets the reach of a 300 mm lens.The difference between the FX and DX lenses is the DX may cause vignetting on a full frame body, whereas an FX lens won't. The full frame sensor doesn't affect the magnification; it affects the size of the view into the world.You'll notice in <a href="http://digital-photography-school.com/crop-factor-explained" target="_blank">this</a> discussion, the type of lens isn't mentioned.BWTHDIK</blockquote>