D5100 16.2 effective pixels, the D5300 24.2 effective pixels seems to be the main difference. What would that translate to besides a larger file? Finer details at larger crops? Would I gain better lighting without having to use higher ISO numbers (not have to pump it up so high)? I also noticed that in comparing these two cameras (I have the D5100) that the ISO numbers are the same but bracketed differently, I'm not sure what that translates to . . . Thanks for any information I mostly shoot wildlife and birds at distances using the Sigma 150-500 and hopefully soon, the Tamron 150-600.
Actually nearly everything has been improved. I've had a D5100, D5200, and now have a D5300. Besides the things already mentioned like doubling the usable ISO level in poor light, It has a much better LCD, improved Video + 1080P 60, and faster processor.