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Forum: Pentax SLR Lens Discussion 12-05-2017, 04:11 PM  
Full frame (manual focus) lenses on crop sensor camera
Posted By Adam
Replies: 8
Views: 870
That's not correct, the focal length always stays the same. It's a common misconception. Just set the focal length to whatever it says on the lens.

With an APS-C camera, a 500mm lens delivers the same field of view as a 750mm would on full frame, but that's only because the latter sees more of the frame. The lens delivers the same degree of magnification.

That said, a 500mm lens is pretty long, and it should give you plenty of reach :) A 50mm on APS-C is also more of a short telephoto rather than a normal field of view.
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