DA50 1.8 and FA50 1.4 will not work on my K-50; AF adjustment would need to be about -11 for it to focus correctly wide open. at -10 it is just ever so slightly off, and wide open the DoF is small enough at portrait distances to show it. Funny thing is I tried the FA on a K1 and it also required and adjustment... of -2, and I tried the DA on a K3-II and it required a -1. Neither of the other two cameras I tested need any other lens I have to be above +10, which means for whatever reason my K-50 hates 50mm at wide apertures. Anything at f/5.6 or narrower images are tack sharp.
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