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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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