>>3867026APS-C gives you a -1.5x equivalent image of a FF. So if you have a 20MP APS-C image and you crop it say 10% you only lose 2MP. Where as a FF image that is 20MP to get the same crop you will lose the initial 1.5x + the additional 10%. I have taken bird pictures with my FF camera and cropping in really looks like dog shit. Pic related.
