50'+ on 10/2 running a compressor is OK, but heavier (8?) would be nicer on compressor, I don't care what the books say. Are you running anyting else off this 10/2 circuit, such as lights, outlets, etc? ( which means you will need a nuetral also) How much duty cycle will compressor be running?

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.