I guess by DSLR standards, a 2013 camera body is getting "long in the tooth" but here is the proof that it is not necessarily the case. I was at Huntington State Park today and as I was leaving, an Osprey with a small fish landed in a tree right in front of me. With the DX crop, my 600mm f/4 ED IF AIS became a 900mm f/4 and although the Osprey was a pretty good ways off I decided to go ahead and give it a shot. Just as the 600mm f/4 AIS never disappoints, neither does the D7100. Below is a comparison of the full frame, no crop image with a box delineating the crop, as well as the cropped image.

And here is a larger image of the final crop:

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