Problem with my K7's autofocus

Tony3d · 09-05-2010, 10:18 AM

I noticed while taking photo's the other day at Disney, that my camera would refuse to lock focus on many of the normal contrast scenes. At home today I experimented with my camera, and found it won't lock focus when the focal length is set anywhere under 28mm about 80% of the time. If I zoom into 30 and above it seems fine. My lens is the DA 18-55mm WR. I also have the DA 55-300, and that works fine at any focal length. So is my problem in the lens or body? Strange thing is it seems to work indoors in artificial light. Go figure.

Adam · 09-05-2010, 03:28 PM

How dark is it indoors? Keep in mind that the image resolution is lower at wider focal lengths, and that if there's not much light, that might slow the AF system.

khardur · 09-05-2010, 03:52 PM

Also it could be possible that two or more objects are falling into the same AF point area you've selected. (the square is just a guide, but the point itself I think encompasses a slightly larger area?

Or if you have it on "auto select" it may be having trouble deciding what point(s) to use, so if that's the case I would suggest selecting the focus point.

Tony3d · 09-05-2010, 05:11 PM

Originally posted by khardur

Also it could be possible that two or more objects are falling into the same AF point area you've selected. (the square is just a guide, but the point itself I think encompasses a slightly larger area?

Or if you have it on "auto select" it may be having trouble deciding what point(s) to use, so if that's the case I would suggest selecting the focus point.

It does it on point or multi point in very decent light. I will call Pentax and see what they say. I'm sure something went. Ticks me off.

Last edited by Tony3d; 09-05-2010 at 06:34 PM.

09-05-2010, 10:18 AM	#1
Tony3d Veteran Member Join Date: Nov 2009 Location: Orlando Florida Posts: 487	Problem with my K7's autofocus I noticed while taking photo's the other day at Disney, that my camera would refuse to lock focus on many of the normal contrast scenes. At home today I experimented with my camera, and found it won't lock focus when the focal length is set anywhere under 28mm about 80% of the time. If I zoom into 30 and above it seems fine. My lens is the DA 18-55mm WR. I also have the DA 55-300, and that works fine at any focal length. So is my problem in the lens or body? Strange thing is it seems to work indoors in artificial light. Go figure.

09-05-2010, 03:28 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	How dark is it indoors? Keep in mind that the image resolution is lower at wider focal lengths, and that if there's not much light, that might slow the AF system. 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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09-05-2010, 03:52 PM	#3
khardur Veteran Member Join Date: Feb 2007 Location: NW Massachusetts Photos: Gallery Posts: 1,560	Also it could be possible that two or more objects are falling into the same AF point area you've selected. (the square is just a guide, but the point itself I think encompasses a slightly larger area? Or if you have it on "auto select" it may be having trouble deciding what point(s) to use, so if that's the case I would suggest selecting the focus point.

09-05-2010, 05:11 PM	#4
Tony3d Veteran Member Join Date: Nov 2009 Location: Orlando Florida Posts: 487 Original Poster	Originally posted by khardur Also it could be possible that two or more objects are falling into the same AF point area you've selected. (the square is just a guide, but the point itself I think encompasses a slightly larger area? Or if you have it on "auto select" it may be having trouble deciding what point(s) to use, so if that's the case I would suggest selecting the focus point. It does it on point or multi point in very decent light. I will call Pentax and see what they say. I'm sure something went. Ticks me off. Last edited by Tony3d; 09-05-2010 at 06:34 PM.