I am a keen wildlife photographer and have invested inlenses (the 70-200 AF-S F4 and 80-400mm AF-S) rather than the camera body up tonow. I currently have a D5200 but have had a few issues with it back-focussingwhich had to corrected by Nikon, and now intermittent ‘Lens not attached’ errormessages with my 80-400mm lens which allows for some movement when attached tothe D5200 body. I am about to send both back to Nikon for this to be looked at.The fact that I will be without a camera whilst this is investigated – and thatthe camera and 80-400 do not appear ideally suited is tempting me to get abetter camera. I want to keep the crop factor so I am looking at the D7100. Butreviews are not consistent as to whether it’s a sensible upgrade and I’m likelyto get better image quality. The sensors appear the same, focusing should bebetter on the D7100, and there are other advantages like dual memory card slotsand weather sealing, but on image results, it’s not clear cut. There’s somesuggestion that the removal of the anti-aliasing filter could improve imagequality – but only with top glass. And I’m not sure if my lenses, even thoughthey cost a small fortune, are considered top glass. Thoughts/advice verywelcome!