ChrisN
Striving
Harry - any of the K-mount (Pentax and third-party) lenses with an "A" setting on the aperture ring will work perfectly with the auto-exposure modes on the Pentax dSLRs. For the M lenses without an "A" setting, you need to select your aperture, focus and compose then press the green button next to the shutter release, for stop-down metering that sets the shutter speed to the correct setting. You can also dial in any necessary exposure compensation and the stop-down metering allows for that. It's a little slower, but not too bad. And of course you can use spot, centre-weighted or matrix metering. It works pretty well.
I think the FA 31 LTD lens (at 46mm equivalent) is the closest to a fast 50, at f/1.8. The excellent FA 35/2 equates to a 52mm and is quite usable at f/2. The older Pentax-F 28/2.8 is one of my favourites - very compact, sharp, pleasant bokeh , fast focusing and gives a 42mm equivalent field-of-view - a true normal lens for the APS-C format. I was lucky to acquire mine before they were "discovered".
I think the FA 31 LTD lens (at 46mm equivalent) is the closest to a fast 50, at f/1.8. The excellent FA 35/2 equates to a 52mm and is quite usable at f/2. The older Pentax-F 28/2.8 is one of my favourites - very compact, sharp, pleasant bokeh , fast focusing and gives a 42mm equivalent field-of-view - a true normal lens for the APS-C format. I was lucky to acquire mine before they were "discovered".
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