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Message: <blockquote data-quote="Bengt Nyman" data-source="post: 476350" data-attributes="member: 13692">Tony is right:For everyday photography where you can get close enough to your subject: USE 1 SERIES LENSES ON 1 SERIES BODIES, DX LENSES ON DX BODIES, FX LENSES ON FX BODIES, ETC.For wildlife where you can not get close enough to your subjects AND YOUR CAMERA DOES NOT OFFER A LENS WITH SUFFICIENT REACH, you can put a larger format lens on a smaller format camera to take advantage of the crop factor. Just remember that the smaller format sensors do produce a lower IQ image. That's why DxO insists on testing lenses on cameras for an accurate assessment of the overall IQ expressed in P-MP or perceptual mega pixels.</blockquote>