35 limited macro trouble

clem · 09-05-2011, 07:22 PM

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.

Adam · 09-05-2011, 07:40 PM

Have you tried applying a slight AF adjustment?

octavmandru · 09-05-2011, 09:23 PM

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.

Octav

Jonathan Mac · 09-06-2011, 12:13 AM

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).

wlachan · 09-06-2011, 12:46 AM

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.

clem · 09-08-2011, 01:37 PM

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.

clem · 09-08-2011, 01:41 PM

The same thing happens on a K-7 and K-10 body. I suspect a loose screw.

clem · 08-04-2016, 11:27 AM

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.

**Nakedgun** · 08-04-2016, 07:57 PM

I apologize for dozing off while waiting for your story's ending...

09-05-2011, 07:22 PM	#1
clem Senior Member Join Date: Aug 2008 Location: Southern New Mexico Photos: Gallery Posts: 119	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
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Have you tried applying a slight AF adjustment? Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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09-05-2011, 09:23 PM	#3
octavmandru Veteran Member Join Date: Jan 2009 Location: somewhere around Posts: 615	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. Octav

09-06-2011, 12:13 AM	#4
Jonathan Mac Pentaxian Join Date: Apr 2009 Location: Madrid, Spain Posts: 10,916	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
wlachan Veteran Member Join Date: Sep 2006 Location: Canada Photos: Albums Posts: 2,625	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
clem Senior Member Join Date: Aug 2008 Location: Southern New Mexico Photos: Gallery Posts: 119 Original Poster	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
clem Senior Member Join Date: Aug 2008 Location: Southern New Mexico Photos: Gallery Posts: 119 Original Poster	The same thing happens on a K-7 and K-10 body. I suspect a loose screw.

08-04-2016, 11:27 AM	#8
clem Senior Member Join Date: Aug 2008 Location: Southern New Mexico Photos: Gallery Posts: 119 Original Poster	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
Nakedgun Loyal Site Supporter Join Date: Apr 2014 Location: Southwest Posts: 1,366	I apologize for dozing off while waiting for your story's ending...