Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-28-2009, 02:18 PM   #1
Veteran Member
Workingdog's Avatar

Join Date: Dec 2007
Location: York, PA
Photos: Gallery
Posts: 733
How to adjust focus

So, I've read a few posts on how to adjust the focus on the K7 / K20/etc. and all seemed to involve a printed chart graduated in cm that one had to set at a 45 degree angle, blah, blah.
I used that method but decided to try another, maybe easier method and see if it gave the same results. Using Scrabble tiles, I used the letters A thru G with A closest and G furthest away. D is in the middle and is the focus point.
The photos below are with the pentax 55-300. 1st taken at 135mm and second at 300mm. You can see that the lens goes from slight backfocus at 135 (compare B & F) to slight front focus at 300 ( compare C & E). So, I'm not going to adjust.
This is the same result I got using the chart.


Last edited by Workingdog; 02-02-2011 at 04:57 PM.
12-28-2009, 08:39 PM   #2
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
It's normal for the in focus range to extend further behind the target than in front. It's only backfocus if the target itself is out of focus, or *way* offcenter in focus zone.
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!
blah, camera, chart, dslr, focus, method, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K7 focus adjust Workingdog Pentax SLR Lens Discussion 3 12-20-2009 01:01 PM
Focus adjust for just one lens on K10D? filmamigo Pentax DSLR Discussion 2 09-04-2009 08:16 AM
k10D focus adjust unkabin Pentax DSLR Discussion 7 08-10-2009 05:11 AM
K20D focus adjust dafiryde Pentax SLR Lens Discussion 9 05-22-2009 09:50 PM
Two ways to adjust focus????? ChipB Pentax DSLR Discussion 15 01-18-2008 06:26 AM



All times are GMT -7. The time now is 01:27 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