Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-03-2013, 01:52 PM   #16
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,801
QuoteOriginally posted by nomadkng Quote
do any of you have a "technique" to compensate?
FWIW, I've found that you can also 'train' the AF to work with difficult scenes by engaging the AF in short bursts, rather than holding the AF button down continuously before a shot. Running the AF in short bursts seems to give the AF algorithms a more precise feel for the features of the subject, so the AF doesn't run right across the range from zero to infinity.

Assigning AF only to the AF button on the camera back can also sometimes help with the process of exercising more control over the AF and your shooting. Many people swear by the AF button.

Just on the centre-focus point, since you have taken the time and effort to test for back and front focus, shot some focus charts etc, perhaps now you can also do some testing to identify the sensitivity boundaries around your centre-focus point... Setup a contrasty object (tennis ball? soccer ball? checkers board?), place it a working distance away against a neutral backdrop, and explore it with the camera AF in centre-point AF-S, monitoring the green hexagon to see when it lights up or not as you move across the focus target. UnknownVT did something like this with his K-x some time ago, using a simple pencil set up on a fence, and it was a good illustration of how precise even the K-x's centre-point could be.

It's also worth rehashing the point that if you want to depend on the AF, and need to shoot wide-open all the time on lenses other than less than 50mm, the narrow DOF will oftentimes kill you as much as any AF sensor blunders.

07-03-2013, 02:00 PM   #17
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
like RAWR says the AF button works very well, expecially with quickshift or HSM lenses. Je focus manually close to the subject and then turn on the AF for the last part.
Almost 99% of the time it will lock onto the subject, since it's the sharpest and closest subject.
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!
background, eyes, feet, focus, focus accuracy, foreground, images, lens, pentax help, subject, wolf
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax F 50mm f1,4 focus accuracy Zafar Iqbal Pentax SLR Lens Discussion 9 05-13-2013 04:35 AM
Focus Indicator Accuracy With Old Manual Lens Siegfried Pentax K-5 24 04-28-2012 06:37 PM
Sigma 70-200 OS FLD, Maybe Have Issue joe.penn Pentax SLR Lens Discussion 23 04-17-2012 07:41 PM
How is low light focus accuracy? yusuf Pentax K-01 11 03-20-2012 11:31 AM
Catch in focus accuracy? [Solved] telly0050 Pentax K-5 25 01-13-2012 03:31 PM



All times are GMT -7. The time now is 11:15 AM. | 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