Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-06-2009, 06:14 PM   #16
Veteran Member




Join Date: Dec 2007
Posts: 923
QuoteOriginally posted by fulcrumx29 Quote
Hi, Kittykat,

I am not quite understanding. How did you solve the front focus issue? Why it is "no more front focusing under even severely yellow sodium lights"?

Thanks,
Tony
On my old K10D, the FA50 f/1.4 tended to front focus under yellowish lighting.
The K-7 doesn't have the front-focus under tungsten lighting issue due to the improvements in the AF system.

This has resolved the only unhappiness I had with this really excellent lens - that's a real bit of satisfaction to me.

Liveview uses a different AF system (contrast detection) from the normal AF (phase detection). So if you are getting accurate AF in Liveview but not under normal AF, you might be having some problems with the phase-detection system.

Check whether you have the same problem with another lens e.g. the kit lens.
Check whether stopping down to e.g. f/8 resolved the problem.

If the camera AF generally functions properly but is having back/front focus issues, stopping down can make a difference in sharpness. But if you have a more general problem with the AF, it will likely mis-focus no matter what the aperture.

08-08-2009, 06:16 PM   #17
Veteran Member
inferno10's Avatar

Join Date: Feb 2007
Location: San Francisco, California
Posts: 342
Definitely looks like you have some front focus on the lens. Have you tried this lens on another body?

My FA 50 needed -4 To get focus right.

- Jason
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, front, k-7, light, photography, tune
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Trying to understand front focus/back focus thing 41ants Troubleshooting and Beginner Help 16 08-31-2010 08:42 AM
Front/back focus or focus shift? fulcrumx29 Pentax SLR Lens Discussion 0 08-17-2009 04:56 PM
Front focus/ back focus on Manual lens. Possible? WangJianWei Troubleshooting and Beginner Help 6 04-20-2009 07:50 PM
How to check Back Focus/Front Focus grishazzz Troubleshooting and Beginner Help 14 03-18-2009 11:35 AM
Severe front / back focusing with K20D hamidlmt Post Your Photos! 9 10-06-2008 01:41 PM



All times are GMT -7. The time now is 04:01 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