no, no, no. The focal length and aperture of the lens do not change. It's simply a cropped image. The apparent magnification from what would have been a 75mm lens is there, but only because of cropping. And, a 75mm 1.2 would have a different DOF structure than a 50/1.2. They're not the same thing in either respect.
Collin * >> Assuming that Pentax eventually sells a DSLR with APS sized sensor, what * >> prime lens would you use on it for your fast normal lens? (assume a * >> lens factor of 1.5x) * * A 50mm f/1.2 becomes a 75mm 1.2!! Portrait City! * Cotty
