Originally posted by Not a Number If you set to AF-S the shutter will release only when you have confirmation so you can use Catch-in-Focus if you like.
This is generally true for AF-S, AF "on" with K-mount lenses, but the OP is using a K-50 with adapted M42 55/1.8. IIRC, the K-50 is one of those models where catch-in-focus will not work with lenses having a non-conductive (painted or anodized) base. If my memory is wrong, please feel free to correct. (I don't have a K-50 at hand.)
Originally posted by Not a Number Focus peaking in LiveView is always an alternative.
Originally posted by enyaw I'm basically looking for focusing aids which the manual doesn't do in depth with. Or a tip, should I use live view?
Magnified live view (press-hold OK button) is the gold standard for manual focus accuracy, but works best when used on-tripod. I am not found of focus peaking (does not work well with some subjects), but to each his own. For more advanced users, an aftermarket focus screen with split-image/microprism focus aides is another option. They work well, but have trade-offs in terms of usability and the need to adjust screen calibration with shims.
Steve