DA* AF problem - diagnostic opinions welcome
stan at stans-photography.info
Tue Oct 27 23:29:15 EDT 2009
Bah - 2nd time today I hit the wrong button. So there we were in the
monthly VTC with the Boss. My turn. I hit the HangUp button rather
than the UnMute button. Bah.
Anyway, as I meant to say in my previous blank message, thanks Leon. I
am afraid you are right about the camera-lens interaction being the
possible cause of the problem. One difference between the two bodies
is that the one where I have the problem has the Battery Grip
attached, the other doesn't. Will try it all again without grip before
I send anything away.
And thanks for the K-7 thought. But next on my list is the 60-250.
Once I recover from that, I may consider the K-7.
> 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 :)
>> 2009/10/27 Stan Halpin <stan at stans-photography.info>:
>>> 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
>>> 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
>>> (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?
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