On Oct 27, 2009, at 6:22 AM, Leon Altoff wrote:
Hi Stan,
It could very easily be a problem with your K20...
the camera and lens need to go in together for service...
Look upon it as an excuse to get a K7 while the 20D is in for the
service :)
Leon
2009/10/27 Stan Halpin <[email protected]>:
The lens in question: DA* 300/4.
Basic symptom - it does not autofocus on my K20.
Expanded description - sometimes it works when first turned on, but
then
refuses to work when woken up after a Sleep period.
"Doesn't work" = nothing happens. It is not mis-focusing, it is
rather doing
nothing - no response to shutter depression or AF button.
Expanded description of "doesn't work" = not only will it not
autofocus, but
I cannot manually focus either. Focus rings turns but nothing
changes.
I tried another DA* lens (50-135) and it works flawlessly.
OK, simple issue, right? Lens needs repair.
So, when it isn't working, I switch the lens, on the lens barrel,
to MF. I
still cannot focus!
So, I also switch the AF/MF switch on the body to MF, and then I
regain
(manual) control.
All pretty definitive so far, it seems that it must be a lens
problem, and
off to Pentax with it.
But when I use the same lens on a second K20, no problem. It works
as it is
supposed to.
Dirty contacts on the lens and/or first body? I cleaned those; no
change in
the lens (mis)behavior.
Any suggestions as to what is going on?
stan
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