Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-06-2012, 09:57 AM   #1
Senior Member
Prairie Dog's Avatar

Join Date: Jul 2008
Location: Las Vegas, Nevada
Photos: Gallery
Posts: 109
DA*200mm Question

I purchased the Pentax DA* 200mm in December last year, brand new. Have used it with my K-r and K5; it works beautifully on both bodies, however, it will not auto-focus at all with my K20D, which by the way, works very well with my DA*55mm and DA*300mm. Am quite familiar with all the custom options, etc. and firmware for all my cameras is up to date, too I am at a loss as to why this lens won't work with the K20D. Has anyone else experienced this?

05-06-2012, 10:06 AM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,616
It definitely should work, so that's weird! Is both the lens and camera set to AF?

Adam Webmaster (Site Usage Guide | Site Help | My Photography) server and development costs are user-supported. You can help cover these costs by donating. 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:

05-06-2012, 10:20 AM   #3
Senior Member
Prairie Dog's Avatar

Join Date: Jul 2008
Location: Las Vegas, Nevada
Photos: Gallery
Posts: 109
Original Poster
Hi, Adam: Yes, both lens and camera set to Auto Focus. I am baffled............if I switch to manual focus on both lens and camera, focus on something, then switch to AF on both lens and camera, the lens will focus to infinity and just hang up there.
05-06-2012, 10:35 AM   #4
Veteran Member
PPPPPP42's Avatar

Join Date: Jan 2012
Location: Wisconsin
Photos: Albums
Posts: 897
I agree that it should work normally.
My K20d will occasionally act up with my only auto focus lens in the way you describe, actually often enough that its rather irritating and kept me from further AF lenses. Usually just hitting the half press a few times sorts it out when it finally reassesses the situation correctly. Try using different focus points maybe that will change something, could be having trouble identifying objects. Maybe there's just something about the light through that lens that gives the programming fits. Be nice to see if someone else has the same setup working correctly.

05-06-2012, 03:26 PM   #5
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,714
A quick thought. The DA*200m use HSM and may require more power than other non-HSM lenses. Is your K20D battery fully charged? Does it have full power? Just a thought... hoping that it may help.
05-19-2012, 09:37 AM   #6
Senior Member
Prairie Dog's Avatar

Join Date: Jul 2008
Location: Las Vegas, Nevada
Photos: Gallery
Posts: 109
Original Poster
Update. I called Pentax and explained the concern. All that could be offered--and the best under the circumstances-- was to send lens and camera in, which I have been considering, but got busy with my life and finally had a little time this morning to re-visit the issue before shipping. Again went through all the motions (and considering the kind advice from those who commented--thanks by the way) with K-r, k5, and K20D with DA*55mm, DA*300mm, and the DA*300mm and came to same conclusion: All 3 lenses work in a marvelous fashion with the K-r and K5 plus the 55 and 300 work fine with the K20D, however the DA*200mm just won't auto-focus with the K20D. I then meticulously cleaned all electronic contacts, K20D and DA*200mm both, still did not work. I then mounted a couple of new acquisitions of manual focus Pentax legacy lenses on the K20D just to test 'em and give the autofocus thing a rest and went back to the DA*200mm thing. What do you know, the K20D and DA*200mm finally introduced themselves to each other and autofocus together in a world class way. I absolutely do not understand what was or was not happening. Happy ending, I hope. The camera and lens are going to the baseball game with me tonight for a workout.

  • 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!
k-mount, k20d, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
DA* 200mm f/2.8 Question Winder Pentax SLR Lens Discussion 8 01-19-2012 02:35 PM
Question regarding weight of FA*80-200mm samski_1 Pentax SLR Lens Discussion 5 10-16-2010 04:33 AM
Newbie Question on Tamron 70-200mm F2.8 leefranke Troubleshooting and Beginner Help 9 09-23-2010 08:04 AM
Sigma 70-200mm question A.M.92 Pentax SLR Lens Discussion 11 08-20-2010 09:37 AM
question on WR 50-200mm/2 Q's TheoSixx Ask B&H Photo! 2 07-18-2010 08:06 AM

All times are GMT -7. The time now is 01:46 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]