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09-05-2011, 07:22 PM   #1
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35 limited macro trouble

I have this intermittent problem with the autofocus beyond 8 feet. When it tries to focus close to infinity, it locks on but the blinking green light will not let me take the picture. It did this before for about 3 weeks, then went away and all was well. As of today, it is not working again. How much does Pentax charge to send it in?

Thanks for any support.

09-05-2011, 07:40 PM   #2
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Have you tried applying a slight AF adjustment?

Adam
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09-05-2011, 09:23 PM   #3
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Are you using AF-C or AF-S? In AF-C you will take a picture regardless of the AF lock.
I am waiting for the short beep (in AF-c) and then fully press the shutter for the picture.

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09-06-2011, 12:13 AM   #4
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I had the same problem with the DA70 when I had it, I missed a huge number of shots so I returned it (& bought the Tammy 17-50 instead).

09-06-2011, 12:46 AM   #5
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There are 4 possible reasons for that:
1) The lens cannot actually hit infinity.
2) The body cannot focus at infinity.
3) The body can focus at infinity but AF back-focus.
4) The screws that hold the focus are loose so the mechanism is shifting in & out.
09-08-2011, 01:37 PM   #6
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Thanks you for the advice. The AF-C is useful since it lets me take the photo when I could not in AF-S. I will decide to send it to Pentax for repair later, at least I can take pictures again.
09-08-2011, 01:41 PM   #7
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The same thing happens on a K-7 and K-10 body. I suspect a loose screw.
08-04-2016, 11:27 AM   #8
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The last chapter to this story is, I had to send it to Pentax and have it fixed. It took a month or six weeks to get it back but it has worked flawlessly ever since.

08-04-2016, 07:57 PM   #9
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I apologize for dozing off while waiting for your story's ending...
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