We have some intelligent individuals on this forum who I figured would be able to help me out with this, because I haven't been able to find a way to calculate this on line. I own a little Canon S120 P&S that I take with me to sports car races when I'm helping out on the pit crew, so that I can kind of document the work that goes on "behind the scenes". The camera has a 1/1.7" sensor with a native resolution of 4000x3000 (12MP, 4:3 aspect sensor). A lot of times I'll crop the image to 3:2, resulting in in ~10.5 MP (4000 x 2667). The lens is a 24-120 f/1.8-5.7. I'm looking to replace the S120 with something that is roughly the same size (can fit in my pocket), yet will give me better low light performance with regards to noise, better video quality, and can give me some more reach (via cropping). The two cameras I'm looking at are a Canon G7X, which has a 1" sensor (3:2, 5472 x 3648) and a 24-100 f/1.8-2.8 lens, and a Sony RX100M3 with a 1" sensor (3:2, 5472 x 3648) and a 24-70 f/1.8-2.8 lens. I'm wondering, if I crop each of the above cameras to say, 120mm, 150mm, and 200mm, what would the resultant resolution be for each? Please note, I selected these cameras because of their sensor size and lens speed. I figure that I can crop more due to the greater resolution and lower noise (lower ISO due to faster aperture), and achieve better results). Thanks for your help!