Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-17-2012, 07:16 AM   #1
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Frustrated focusing issue!

Okay, I love my K-5, especially the DR and the high iso performance. However, I am starting to have issues using my Pentax 35/2.4 AL lens with my K-5. The darn thing will just not focus using center-point but I don't seem to have an issue using auto-5 or auto-11. The issue is that I don't like using either of those focus modes. Any suggestions?

09-17-2012, 07:24 AM   #2
Pentaxian
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 10,315
Wait, you mean it won't focus correctly, or the machine refuses to run AF?
09-17-2012, 07:25 AM   #3
Loyal Site Supporter




Join Date: May 2011
Location: Richmond, Virginia USA
Photos: Gallery | Albums
Posts: 2,625
have you checked the calibration on the lens
09-17-2012, 07:29 AM   #4
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
There are a lot of threads on AF and the problems with the 11 point AF Pentax uses. The main takeaway for me is that the center AF point is NOT as small as the little red square you see in the viewfinder - its about as big as the ( ) marks in the viewfinder. Try thinking about that and see if something within the area covered by the ( ) marks isn't in focus instead of what you intended.

I'll beat others to the punch and say - post some photos with the problem

09-17-2012, 07:59 AM   #5
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Original Poster
QuoteOriginally posted by Na Horuk Quote
Wait, you mean it won't focus correctly, or the machine refuses to run AF?
While in AF-s the lens just keep trying to focus while making that horrible "I can't focus" noise. I have no problems using the 18-55 kit lens that came with my K-r though. I have tried using the calibration feature in the camera using the + and - settings but that does not seem to make a difference. I added a link to the OOF images....I finally got it to focus on the last image (the 1st one on my flickr page). I deleted about 4 more images that were also OOF.

Flickr link: Flickr: treebeard1968's Photostream

Last edited by treebeard; 09-17-2012 at 08:09 AM.
09-17-2012, 08:13 AM   #6
Senior Member
GoldenRGuy's Avatar

Join Date: Dec 2010
Location: Kingston, Ontario
Photos: Albums
Posts: 154
QuoteOriginally posted by treebeard Quote
While in AF-s the lens just keep trying to focus while making that horrible "I can't focus" noise. I have no problems using the 18-55 kit lens that came with my K-r though. I have tried using the calibration feature in the camera using the + and - settings but that does not seem to make a difference. I added a link to the OOF images....I finally got it to focus on the last image (the 1st one on my flickr page). I deleted about 4 more images that were also OOF.

Flickr link: Flickr: treebeard1968's Photostream
Maybe try turning the camera off, pulling the battery (with the lens still on) then turning it back on. I sometimes get the "failure to find focus" with my Tamron 18-75, but turning it off and on seems to fix it.
09-17-2012, 08:16 AM   #7
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Original Poster
I will try that.
09-17-2012, 08:18 AM   #8
Pentaxian
JinDesu's Avatar

Join Date: Jun 2011
Location: New York City
Photos: Gallery
Posts: 5,624
Can you try aiming at a very obvious object? Like, a flat poster with a nice contrasty element?

If it focuses straight on, try moving around angles and see what happens. Aim to keep the solid contrasty element centered.

09-17-2012, 08:32 AM   #9
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,576
I have to ask (I always do): do you have a UV or 'protection' filter on that lens? If yes, take it off, put a hood on the lens, and try again.
09-17-2012, 08:39 AM   #10
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Original Poster
Okay, so this is interesting. I checked the battery and then noticed that it was one of the 3rd party brands I bought as backup (Pearstone). I pulled it...put the genuine Pentax battery in and then proceeded to use the lens with apparently no issue. I had no problems focusing on the flowers I used as an example. Weird or what?!
09-17-2012, 08:42 AM   #11
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,312
QuoteOriginally posted by treebeard Quote
Okay, so this is interesting. I checked the battery and then noticed that it was one of the 3rd party brands I bought as backup (Pearstone). I pulled it...put the genuine Pentax battery in and then proceeded to use the lens with apparently no issue. I had no problems focusing on the flowers I used as an example. Weird or what?!
put the questionable battery back in, and while attempting to focus, (suggest on a tripod to allow you to move away from the view finder) watch the top display as you are focusing. If it starts to fade, or goes off etc, then the third party battery, for what ever reason is dropping too low for things to work properly
09-17-2012, 08:44 AM   #12
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Original Poster
What I noticed is that before I took the battery out I was shooting at f/2.4, after turning the camera off and putting the Pentax battery in the aperture was f/5.6 and I swear I did not touch any dials!
09-17-2012, 04:35 PM   #13
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,576
That battery issue is not surprising.

The camera is like a PC. Try running your desktop computer on a wonky power supply and you'll see all sorts of problems start to randomly appear.

My K-x would also sometimes have issues with AF performance, depending on what kind of batteries you put in (Lithiums vs alkalines vs eneloops), and battery charge too.
09-17-2012, 05:26 PM   #14
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Original Poster
Just got back from the beach. My k-5 and Tamron 70-200 gave me some more focusing issues. It seems that center point focus has become useless for me. I can't even use it to focus on a post that's an easy target at 70mm. I am starting to wonder if I need to send the body in for checking. I love this camera, but I am not sure why my lenses hunt so damn much!
09-18-2012, 02:33 PM   #15
Veteran Member
treebeard's Avatar

Join Date: Nov 2008
Location: Windham, NH
Photos: Gallery | Albums
Posts: 795
Original Poster
Problem found!

What a knucklehead I am. I put the Tamron 70-200 on my k-r and I was like, "wow, that focuses fast!" After looking at the contacts on my K-5 I noticed alot of grime and stuff where the lens meets the body. I cleaned the contacts with an eraser and wiped the grime off and behold, I can now use center focus and my lenses seem to SNAP to focus quickly now. Sheesh.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, focus, issue, k-5, k-5 ii, k-5 iis, k5, pentax k-5
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma focusing issue sagarajack Troubleshooting and Beginner Help 2 09-03-2011 04:16 PM
odd issue with focusing olaf ibsen Troubleshooting and Beginner Help 7 04-03-2011 12:22 PM
Focusing issue with DAL35? epqwerty Troubleshooting and Beginner Help 10 01-30-2011 04:43 PM
31LTD focusing issue... beaumont Pentax SLR Lens Discussion 8 12-28-2010 08:25 PM
Why focusing issue? YJD Pentax DSLR Discussion 9 11-15-2010 01:57 PM



All times are GMT -7. The time now is 05:29 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top