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Hi /p/, I'm thinking of buying an old Pentax ~30..50mm prime lens to complement the 18-55 kit lens that I've used for about 10 years. I've made some research about smc pentax-A 50/1.7, this model would be dirt-cheap and give all the auto-exposure modes of the camera (K10D). Pic related, the f1.7 performance of this lens (found it from the web). Should I get this one or look for another lens?
I have already made some experiments with my friend's M42 screw-mount Takumar lens. I'd prefer having the K-mount lens as it's clumsy to use the M42 lenses on a DSLR.