Nikon D810 has a 36.0MP Full frame (35.9 x 24 mm ) sized CMOS sensor and features EXPEED 4 processor. You can shoot at maximum resolution of 7360 x 4912 pixels with aspect ratios of 5:4 and 3:2. D810 has a native ISO range of 64 - 12800 which can be boosted to 32 - 51200 and it can save files in RAW format which gives you a wider room for post processing.
Nikon D810 is not the highest resolution Full frame camera. Blackmagic PYXIS 12K with its 98.8MP sensor is leading in this class. Check the comparison of Nikon D810 vs Blackmagic PYXIS 12K or take a look at Highest resolution DSLR cameras list.
Nikon D810 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Nikon D810 sensor has been tested by DxO Mark and got an overall score of 97 for its image quality. You can find the details of their analysis of Nikon D810 here.
Anti-Aliasing Filter
Another important feature about Nikon D810's sensor is the lack of anti-alias (Low-pass) filter. Removing anti-aliasing filter increases the sharpness and level of detail but on the other side it also increases the chance of moiré occurring in certain scenes.
Let's look at how the size of the Nikon D810's Full frame sensor compares with other standard sensor sizes.
Comparison image of Nikon D810 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Nikon D810 gives you at any given aperture.
You can
calculate
the exact depth of field for the Nikon D810
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and the very shallow focus zone you get with long telephoto lenses.
