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Hi Cristian
I use my old Sigma (24mm), Pentax (135mm), Vivitar (70-210mm) and Tokina (500mm) lenses with my Pentax *ist DS. They are all K mount lenses and require manual focusing and manual settings to set the aperture. There are a couple of settings in the *ist DS menu system where you can allow the use of older K mount lenses that do not have auto focus or auto metering.
Old is not always good as I have a Pentax 135mm f2.8 lens from around 1990 and it is useless on stars unless manually stopped down to f8.
Cheers
Dennis
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