While reading the photography part on flipboard (Smart phone app) A guy named Dzvonko Petrovski is talking about crop v full frame sensors.

Edited quote:
A 50mm F2 lens on full frame is as expected a 50mm F2. On a 1.5 crop sensor, it is a 75mm F3.

Link here:
http://www.lightstalking.com/?s=camera+sensor+size


Huh???????? A lens gets darker on a crop sensor????


James

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