The D7100 is a well-built enthusiast DSLR that offers impressive image quality and easy access to shooting parameters along with a high degree of customization options. Video output is a bit disappointing and a very small image buffer limits sports shooters to JPEG-only mode.
By supercharging the resolution with a 24.1-megapixel CMOS sensor and removing the optical low-pass filter to capture finer detail, the Nikon D7100 delivers the best image quality we've ever seen in a Nikon APS-C-type DSLR. Add in a new 51-point autofocus system, full 1080p HD video recording with full-time AF, a nifty 1.3x crop mode that extends the camera's reach, and many more advanced, near-pro-level features, and it's clear the D7100 is a serious tool for shooters who want to get more serious about their photography.
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The Nikon D7100 is a worthy successor to the D7000 and a sufficiently capable camera to fill the vacancy at the top end of Nikon's DX range for all but the pro sports photographers or studio strobists out there. Perhaps understandably, a lot of the attention it has received since its launch has focused on its absent optical low-pass filter, with inflated expectations of a resultant boost in sharpness and definition. It now looks like any resulting increase in quality over the company's other 24 Megapixel DX bodies is at best, marginal, and many will no doubt be disappointed by that. But don't lose sight of the fact that OLPF or not, the D7100's sensor produces superb quality 24 Megapixel images
The D800 combines swift operation and well-designed controls with outstanding image quality that is particularly impressive at high ISO settings. Expanded video capabilities hold appeal those who need to produce both stills and video while on assignment. The camera's 36MP sensor allows for class-leading resolution in a 35mm format camera...if you're prepared to hold your technique and equipment to the highest standards.
The D800 models are strong performers that can produce knock-your-socks-off results in the right hands, with the right lenses, with the right technique. They are not cameras for everyone, however.
The Nikon D800 is a triumph for still shooters. The new 36 Megapixel full-frame sensor delivers tremendous quality, comfortably out-resolving the Canon EOS 5D Mark III while matching its noise levels when viewed at 1:1. For the best quality you should be shooting in RAW, but even the D800's in-camera JPEGs using the default settings are very pleasing. This really is getting close to medium format quality but from a body that's smaller, quicker and much cheaper, not to mention superior at higher ISOs.
I am very impressed by the Nikon D800. Coupled with some pro-level Nikkor prime and zoom lenses such as the Nikon 24mm f/1.4G and Nikon 70-200mm f/2.8G, the Nikon D800 will become the camera of choice for my photography needs.
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In actual use, the Nikon D800 is a fantastic tool that seldom disappoints - the biggest quibbles you are likely to have with it, especially if coming from a D700, D300 or D300S, concern interface changes such as the swapping of the zoom buttons, the disappearance of the physical AF Area selector or the repositioning of the Mode button...