Sensor specs
In fact, the D5500 features the same 24.2 million pixel APS-C sized (DX format) sensor as its predecessor, the D5300. This sensor has no anti-aliasing filter, which makes it better able to resolve detail than those with an optical low pass filter. This does mean that there is a possibility of moire patterning appearing in certain images, but it hasn't proven to be a problem for the D5300.