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but the 100/f4 is all manual and I don't think the aperture will properly adjust (in other words, I can manually set it to 22, but I'm not seeing any difference between f22 and f4) whereas the 50 is an "a" and will adjust DoF nicely.

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IIRC, and I'm sure a proper Pentaxer will be along to confirm or deny, but with fully manual lenses yo have to go into the custom menu and find a particular function which is called something like 'Enable Aperture Ring'... When set to the correct value I think this then allows the camera to read the position of the aperture ring when metering and to stop the lens down to the correct aperture on exposure.

HTH

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Indeed. The OP's Samsumg is basically a K100D (I believe) - so go to the custom settings menu, enable aperture ring, and set preview to 'proper' stop down, rather than 'digital preview.' Then, in M mode (can't speak for the others 'cos I don't use them) set aperture on lens, quick twist the on/off switch to the right, and the lens stops down. It'll show the 'correct' exposure (centre weighted mode) as 0.0 or over/under exposure as anything between -3.0 and 3.0. Adjust as desired. I have set the AE-L button to quick shift the shutter speed to the 'correct' value for my given aperture. This works really well, much quicker than this description would make it sound.