Nikon D5500 has a 24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Expeed 4 processor. You can shoot at maximum resolution of 6000 x 4000 pixels with aspect ratios of and 3:2. D5500 has a native ISO range of 100 - 25600 and it can save files in RAW format which gives you a wider room for post processing.
Nikon D5500 is not the highest resolution APS-C camera. Fujifilm X-E5 with its 40.0MP sensor is leading in this class. Check the comparison of Nikon D5500 vs Fujifilm X-E5 or take a look at Highest resolution DSLR cameras list.
Nikon D5500 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Nikon D5500 sensor has been tested by DxO Mark and got an overall score of 84 for its image quality. You can find the details of their analysis of Nikon D5500 here.
Anti-Aliasing Filter
Another important feature about Nikon D5500'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 D5500's APS-C sensor compares with other standard sensor sizes.
Comparison image of Nikon D5500 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Nikon D5500 gives you at any given aperture.
You can
calculate
the exact depth of field for the Nikon D5500
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.
