I recently bought a Pentax-A SMC 50mm f1.7. In initial testing, it seems to do very well. One thing confuses me: My K-50 wants me to input the focal length. Should I input 50mm, or should I input 35mm as this is an APS-C camera? I cannot see any real difference from test shots. Both seem underexposed a bit, but this is easily taken care of by kicking up the EV by 1.5-2.0.
Especially for the price, this seems so far like an exceptionally clear lens once stopped down a bit.
Any help would be appreciated. My other A lens seems to communicate its focal length directly to the camera computer.
Last edited by jgnfld; 03-04-2015 at 09:59 AM.