Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-26-2010, 03:14 AM - 1 Like   #1
New Member




Join Date: Nov 2010
Location: Rome
Posts: 2
Trap focus using non-central AF points

Hello all I have just joined this forum and this is my fist message!
Reading previous threads it appears that with a K20D and using a DA* lens such as the DA*60-250 or DA*50-135 it is possible to use trap focus (also known as snap focus or catch focus) without being limited to use the central focus point. In other words by setting these lenses to MF (using the button on the lens) it should be possible to SELECT the AF point (one of the 11), or else use AUTO and let the camera choose the AF point to trap focus with. Has anyone had experience with this method, does it definitely work? Important for me as I am contemplating buying a DA*60-250mm lens for this reason. I am a nature photographer. Thanks!

11-26-2010, 04:52 PM   #2
Forum Member




Join Date: Jun 2008
Location: New Jersey, USA
Posts: 93
As far as I know it's limited to center focus only. I've used it on manual and AF lenses. Including the 50-135 and 16-50.

Fred
11-26-2010, 11:04 PM   #3
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
Hi Dipper,

You are correct in your assumption that it works with all 11 focus points -- I just tried it with my K-7 and DA* 50-135. I already had it set to "Catch-in Focus" "on", set the AF to AF-S, and switched the DA*50-135 to "MF". Using SEL mode, I set the focus point to the farthest to the right, held a subject at that point, then rotated the focus ring while holding the shutter full down. When the subject came into focus, it fired, indicating the full right line sensor location.

Nice thinking!

Scott
11-30-2010, 03:56 AM   #4
New Member




Join Date: Nov 2010
Location: Rome
Posts: 2
Original Poster
Thanks a lot Scott for verifying that this actually works! I will go ahead now with my purchase, I'm assuming that if it works with the K-7 it will also work on the K20D, (I know it will NOT work using the K10D). Also you tested using the DA* 50-135 lens while I am interested in the DA*60-250mm lens, but I'm sure this won't be a problem as they are both in the same "family" of lens. Thanks again! Paul

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!
af, camera, dslr, focus, lens, photography, trap, trap focus
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to use Trap-focus or Catch-in focus eurostar Pentax DSLR and Camera Articles 34 07-22-2017 08:29 PM
Trap AF focus Eruditass Pentax DSLR Discussion 27 02-06-2010 10:39 PM
K-7 Focus Points jolinjo Pentax DSLR Discussion 3 11-11-2009 01:41 PM
Focus trap with non center focus points? RichyX Pentax SLR Lens Discussion 4 11-07-2009 09:48 PM
Focus trap roy Pentax SLR Lens Discussion 15 03-13-2007 06:04 AM



All times are GMT -7. The time now is 04:48 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