On Feb 11, 2009, at 12:15, jtainter wrote:
Now I have another sample of the lens showing the same af problem.
Tonight if I'm not too tired I'll test it with the standard focus
adjustment chart. It's possible that I can correct the problem with
focus adjustment. I believe that is what Pentax did when I sent the
first one in.
I usually keep a skylight filter on each lens, but at the moment
there is no filter on this lens. So I know that is not throwing off
the af.
Mine does that sporadically on my K10D, too.
Autofocus on... it'll zip to (approximately!) infinity, and then the
little green "I'm in focus!" hexagon in the viewfinder just flashes
quickly, indicating that the camera has given up and can't do it.
The quick'n'dirty solution for that if I'm in a hurry is to switch to
AF-C and it gets "close enough" and takes the shot even though it
THINKS it is not in focus.
The slower and more precise solution is to click the lens into M mode
and focus by hand - pain in the arse.
The FINAL solution would be to send in the K10D and the lens and let
Pentax figure it out. Don't want to do that yet.
FWIW, once upon a time it was actually not able to even REACH
infinity. Confirmed it on a couple of bodies (including my old ME
Super) that you couldn't quite get there. That was a defect which
they fixed, but unfortunately the occasional "I ain't gonna do that"
happens when it's at 16-17mm and I'm looking at a subject at
(relative) infinity.
-Charles
--
Charles Robinson - [email protected]
Minneapolis, MN
http://charles.robinsontwins.org
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