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Message: <blockquote data-quote="wornish" data-source="post: 336437" data-attributes="member: 15434">What Lee said in his original post makes a lot of sense to me.I have a D800 but really really want a D7100 as well because of the quality of the bird photos seen on here.  I have tried the Nikon1 V1 for birds as that gives even more reach but no where near the D7100 IQ.The extra reach of the DX vs full frame makes a big difference with very little if any loss in IQ except when the bird is very near. To get the equivalent reach of the 100-600 lens - D7100 on a D800 you have two choices.   Use a teleconverter and lose some IQ or pay crazy money for an exotic 800mm lens which weighs a ton and really can't be used for birds in flight without a heavy duty gimbal, not a walk about solution.</blockquote>