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I use this lens on a fairly old Pentax K-X. The manual focus ring is a bit stiff in my opinion and the depth of field isn't much different from f2.8 to f22. I also don't notice any change in lighting from the range of aperture.
This is a superb lens for the Pentax K system. Smooth focusing, nice feel and creates good images. Manual focus only but not an issue for me. Hard to beat for the price.