Tim,
Don't know about Tokina, but Pentax A series lenses work just fine
when set to A.
They let you use P mode or Av or Tv...set the aperture with the front wheel.
Nothing different from the FA or DA lenses except no autofocus.
Regards, Bob S.

On Mon, Jun 8, 2009 at 4:50 PM, Tim Bray<[email protected]> wrote:
> I went and bought a Tokina 400mmF5.6 K-mount on EBay.  I'm looking at
> the instructions in the K20 booklet and they're sort of gnomic;
> there's a custom-menus thing that allows the use of an aperture ring,
> but best practices aren't obvious.  Anyone want to recommend a good
> write-up on how to get this kind of thing to work nicely with a modern
> camera?  I guess it'd be all-Av-mode-all-the-time, right?
>
>  -Tim
>
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