Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-14-2012, 06:58 AM   #1
Forum Member
Falld5's Avatar

Join Date: Apr 2009
Location: USA
Photos: Gallery
Posts: 61
K20D and sigma lens error

At a wedding shoot this weekend I had my Sigma 17-70 f2.8 mounted on my K20D. I also had my AF540fgz speed flash on my bracket. All working fine...and just as the bride was starting to walk down the isle, (not kidding here ) the K20D got an error message on the aperature screen F---. The camera totally froze, and would not fire AT ALL. matter what setting I flipped it too. (I had a backup that I was using for zoom shots and did get the bride...thank heavens.) Once I was in the back of the church, I disconnected the lens and flash from the camera, and reconnected everything, and that seemed to fix it. Also, I have to the reception, I had on aperature priority, as I usually do, and let the camera pick it's own shutter speed. Had flash on aperature priority also, setting iso and aperature to camera settings. (which were about 800 iso and f/4. The shutter speed did not work properly, absolutely ruining the shot, shutter speed adjusting itself to .5. Does anyone know if this is due to the sigma lens on a k20d, or if this would be an internal camera body error? I can still return the sigma lens for a replacement but really like the quality of this lens. Any thoughts from anyone are really appreciated.

05-14-2012, 07:19 AM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,118
Sounds like there may have been a connection issue between the camera and the lens- I'd try cleaning the lens contacts.

Adam Webmaster (Site Usage Guide | Site Help | My Photography)'s high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

05-14-2012, 07:35 AM   #3
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
Clean the contacts on both lens and camera. Try the Sigma on the other body (assuming it's a Pentax as well); that would eliminate one of the two as the culprit.

As this is an intermittent fault, long term testing is needed to figure it all out; bad contact inside the lens or body is also a possibility.

Note that flash does not have an 'aperture priority' mode; it's PTTL/TTL or Auto or Manual or SpotBeam. I assume you were in PTTL as settings were copied from camera to flash. In A mode, settings are not copied (at least not on K10D, not tested on K5).
05-14-2012, 10:58 AM   #4
Forum Member
Falld5's Avatar

Join Date: Apr 2009
Location: USA
Photos: Gallery
Posts: 61
Original Poster
Thanks to both replies. My appologies for making a mistake with my wording. I was using Manual mode on flash using the same aperature and iso as the camera. I'm aware that it doesn't have 'aperature priority'.


  • 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!
aperature, camera, error, flash, k20d, k20d and sigma, lens, pentax help, shutter, sigma, sigma lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Pentax K20D and Sigma 17-70mm f/2.8-4.5 Lens (CONUS) xyalek Sold Items 4 01-14-2011 10:55 PM
Would a SIGMA non-DG lens be a problem in a K20D? peru Pentax SLR Lens Discussion 3 09-12-2010 05:53 PM
TOKINA RMC 1:3.5/70-210mm PENTAX K-mount F error on my K20d gybp Pentax SLR Lens Discussion 3 12-10-2009 12:02 PM
K20D Error - Images cannot be stored mkz Pentax DSLR Discussion 5 07-20-2009 09:55 PM
K20d- Memory Card error Timtast1c Pentax DSLR Discussion 5 06-08-2009 11:34 AM

All times are GMT -7. The time now is 06:22 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]