Lefr0n-
If it's an m42 mount (threaded) then super takumar 50mm f/1.4 or 55mm f/1.8. Hell, any super takumar. The 28mm is wonderfull. They also did an amazing 85mm but it's rare.
I have the 28, 50, 135 and 200mm. All fantastic and can be adapted to use on the canon too, if your manual focusing skills are OK. -
For k mount the 50mm f1.7 SMC A is a total banger and you can still buy them for £35.
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Check what mount your camera has - as well_is_it said there's the m42 screw type, after that pentax had it's own "k" mount.
Always found this database pretty useful: http://www.pentaxforums.com/lensreviews/ (scroll down to "Film era Pentax K mount lenses", then check the "A prime lenses" and "M prime lenses").
All these are of great built quality, really a joy to use!
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Well_is_it
miro_o
salad
Hi,
..what Well_is_it said, look for "EF" lenses (not EF-S, they are only for crop-sensor digital cameras).
After that it really depends on what (focal length) you want, and what you're willing to spend.
I'm also a big fan of the 40mm EF STM, you can get this for about £80 on eBay, it's fantastic.
The 50mm's are all good value for money as well, find used ones or just get the new STM.
If you don't want / need auto-focus there's a lot great lenses for your Pentax that can be had for really cheap as well..