Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-07-2009, 07:24 AM   #1
New Member




Join Date: Apr 2009
Location: Richmond, VA
Posts: 14
Sigma 20 1.8, nails close focus, back-focuses at a distance. What to do.

All in all, I really like this lens. Despite reviews to the contrary, I have found it to be respectably sharp wide open, as long as the focus is nailed. But, it does consistently back-focus at any distance longer than arms length. Closer, it nails it. I'm inclined to believe it has more to do with the K20d's not-so-stellar AF system, as apposed to the lens itself...

My dilemma is this; do I try to correct the auto focus for subjects farther away, likely causing forward focus on close subjects, or just say eff it, and learn to manually focus better? The latter being what I have done mostly to this point.

I feel like I know the best answer here, but would like some others' input as well...

05-07-2009, 11:38 PM   #2
Veteran Member
blende8's Avatar

Join Date: Feb 2007
Location: Bremen, Germany
Photos: Albums
Posts: 1,521
Things like this normally happen, when the camera AF is not perfectly calibrated.
You could send the camera in for an AF calibration.
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!
distance, focus, k-mount, lens, nails, pentax lens, slr lens, subjects
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Back Focus in a new Sigma 28mm lens Nick Siebers Ask B&H Photo! 1 08-20-2010 06:24 AM
Sigma 70-200 HSM and front-back-focus alexulo Pentax SLR Lens Discussion 0 04-08-2010 05:34 AM
Tamron 18-250 close focus distance raider Pentax SLR Lens Discussion 6 09-13-2009 09:11 PM
Lens focuses fine at close distance, not sure about infinity? bdery Pentax SLR Lens Discussion 4 08-16-2009 12:43 PM
New Sigma lens front focuses slightly... joeyc Pentax SLR Lens Discussion 7 06-26-2009 04:04 PM



All times are GMT -7. The time now is 12:18 PM. | See also: NikonForums.com, CanonForums.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