Rumors of the full frame Nikon D750 have been floating around for a little over a month now, and where there's smoke there's usually a fire. To wit: Nikon just officially pulled back the curtain on its latest SLR, and it packs quite a bit of oomph into a body that's only $2299. The D750's foundation is awfully solid with its 24-megapixel FX format CMOS sensor, an Expeed 4 image processor (the same one seen in bodies like the much pricier D810), a more light-sensitive 51-point autofocus system, and an ISO range that stretches from 100 to 12,800. Oh, and did I mention it packs better battery life and some carbon fiber trim to keep the weight down? What might really put the D750 over the top for some of you, though, are some of the firsts that it boasts.