k20d autofocus adjustment
Will the autofcous adjustment on the k20d work with 3rd party lenses or only Pentax lenses?
It works with all AF lenses - but it can only remember 20 of them at a time.
The only possible problem with 3rd party lenses is that sometimes the camera can't read the chip properly. It will read something, though, so it would only matter if you had two lenses that it happened to read the same and they need different adjustments.
First camera 1953, first Pentax 1983, first DSLR 2006