Quote:
Originally Posted by Mr. Pickles
As for the in-body IS, which is becoming popular from those other than Canon or Nikon (IS in the lens is "better", especially for longer lenses, but does cost), it should work with ALL the current Pentax lenses, but may NOT work with older ones, with or without an adapter. The reason is the electronics between the lens and body. If the camera isn't allowed to tell what the focal length of the lens is, it can't compensate for camera shake. So, naturally, manual lenses won't work with IS.
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While it is true that the body needs to know the focal length of the lens for in camera SR (shake reduction as Pentax names it) to work, the K10D (or K100D) displays an additional menu when switched on with a lens not reporting the focal length. The menu lets the user select manually the focal length. So SR even works with old M42 lenses.
I have used SR with 30-35 years old M42 lenses without any problem.