Can I use old Pentax lenses from the film days on the newer Pentax DSLRs?
Are there any caveats or exceptions? Are adapters or modifications needed?
Answer
Yes, all Pentax DSLRs accept all K-mount lenses. This includes autofocusing (if applicable), focus confirmation, metering, IS, etc.
The oldest two series, K and M series (database), do not have aperture contacts, and thus do not work with Av and Tv mode. Instead, you'll have to use M mode, but you will get meter readings. It can also suggest a shutter speed if you push the +/- or green button (depending on camera model and settings). Metering on these digital SLRs tends to be noticeably more inconsistent than on on the film SLRs they were designed for. These two series do not get matrix metering, just center-weighted and spot, but do get focus-trap.
There is a rare breed of K-mount that Ricoh used, called "KR" mount. They have an extra pin which will get stuck if it is not removed.
You can also get a M42-PK adapter and use the endless supply of great cheap screwmount lenses available at ebay, pawnshops, etc. They will have focus confirmation, IS, center/spot metering, and can actually use Av mode as they will stop down with the aperture ring.
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