Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
02-12-2015, 09:42 AM   #1
Site Supporter
slip's Avatar

Join Date: Oct 2006
Location: 2 hours north of toronto ontario canada
Photos: Gallery | Albums
Posts: 3,533
Body or the lens?

Hello everyone
I am down in Costa Rica and having issues with my Sigma 70-200 2.8 ex apo on my K5 iis. Sometimes when I want to focus the lens only moves a little bit. I push the shutter half way down a bit and it does the same thing. It does this several times then sometimes it locks focus and sometimes not. If I move the focusing ring back and forth with my hands it will work fine then stop working properly again. Could this be the lens or the screw motor in the body? Other lenses seem to work fine but they are not as heavy as the 70-200 either.
I cleaned the body and lens contacts and it doesn't help.
We are checking out a place where the monkeys hang out so this is my go to lens if I can get it going.
Any and all opinions welcomed!



02-12-2015, 09:51 AM   #2
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,770
Hard to be positive without the camera in my hands. But if other lenses are working, that seems to me to be the lens is the problem. Does it work with manual focus all the time? If you can manual focus is the focusing ring stiff? Maybe something bent or something stuck in the focusing helicoid.
02-12-2015, 10:39 AM   #3
Junior Member

Join Date: Aug 2008
Location: New Jersey
Posts: 45
I had problems focusing with a Sigma 170-500. It turned out that the tiny screws on the mount on the lens were loose. I tightened them with a precision screwdriver and the problem was solved. Maybe the weight of the lens loosened the screws.
02-12-2015, 12:30 PM   #4
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
Clean the contacts of the lens if it is only this lens. Seems trivial but it can "cure" such problems occasionally.

02-12-2015, 02:00 PM   #5
Veteran Member
rburgoss's Avatar

Join Date: May 2008
Location: San Jose, Costa Rica
Photos: Gallery | Albums
Posts: 972
As others said. Clean contacts (lens and body), check mount screws for tightness (lens and body) and test again. Does it happen just in one body? Do you have another body to test the lens separately?

I live in Costa Rica. Depending on where you are and your trip plans, perhaps we can arrange something to test lens by itself and maybe even have the service shop look at it. Let me know. I'll be checking this thread frequently.
02-13-2015, 04:52 PM   #6
Site Supporter
slip's Avatar

Join Date: Oct 2006
Location: 2 hours north of toronto ontario canada
Photos: Gallery | Albums
Posts: 3,533
Original Poster
Thanks everyone for the help. Yes it was the contacts... But they needed to be cleaned with a lens cleaner before the lens would work.



  • 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!
bit, body, camera, focus, lens, pentax help, photography, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Upgrade Body or Lens? iClick Pentax DSLR Discussion 45 01-16-2015 05:50 PM
Used body or new lens Pentax_SLO Pentax DSLR Discussion 18 12-07-2014 02:32 AM
Buying a lens with or without camera body tjstimbo Pentax K-3 6 10-28-2013 11:51 AM
For Sale - Sold: Pentax K-7 Body or Body with 18-55 WR Kit Lens - Price Reduced boysent Sold Items 7 04-24-2012 03:37 PM
Best starting lens? Cheap body and nice lens? or nice body and okay lens? lovemehate Troubleshooting and Beginner Help 52 10-12-2010 07:27 PM

All times are GMT -7. The time now is 05:23 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]