Unless it's an KA mount lens, you'll only get the maximum aperture in Av
mode. To use the full aperture range you'll have to use M mode and the
green button if it's a K lens.
To get the camera to work with the Lens off the A position, (of it it's
a K lens), find the menu option that allows the camera to fire when the
lens isn't set to A. You set the camera to anything other than M and
you'll get auto exposure at maximum aperture and auto shutter speed.
Set it to M and you can get instantaneous stop down metering at any
aperture by pressing the green button. Best practice is whatever suits
your needs, if light levels are low enough that you're only going to be
using the maximum aperture then use Av mode. If there's enough light to
use smaller apertures then use M mode and the "Green Button". I don't
know if this works with the K20, (it works with the *ist-D and Ds), with
a K lens or Ka/F/FA lens off the A setting in M mode you can hold the
DOF preview in and get continuous stop down metering just like a pre F
Spotmatic, (well sort of).
Tim Bray 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
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
--
--
The free man owns himself. He can damage himself with either eating or
drinking; he can ruin himself with gambling. If he does he is certainly a damn
fool, and he might possibly be a damned soul; but if he may not, he is not a
free man any more than a dog.
--G. K. Chesterton
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
