The D750 is fairly small when you consider its full-frame image sensor is more than double the size of an APS-C camera like the Nikon D7100 (4.2 by 5.3 by 3 inches, 1.5 pounds) in terms of surface ...

For about $600 more than the price of the D610, the Nikon D750 gives you the EXPEED 4 processor, the AF and metering systems and shutter/mirror mechanism of the D810 and throws in Wi-Fi and a tilting ...