Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
08-29-2010, 01:39 PM   #16
Veteran Member
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
Best way I know to see what I'm talking about: actually do the test I mentioned using text on an angle. Note which lines appear in focus in the viewfinder, then take the picture (wide open aperture) and note which lines appear in focus in the shot. If your lens is faster than f/2.8, you'll see a noticeable discrepancy - more lines appearing in focus in the viewfinder than in the actual picture.

Until one fully comes to grips with this, it's easy to jump to the conclusion - as I initially did when I "discovered" the effect first time I tried manually focusing a 50/1.4 - that something is wrong with the camera or the lens or your eyesight. I blamed the camera and sent it in for service; not surprisingly, it came back unchanged. Took weeks of obsessive focus chart testing and Googling before I finally figured out what was going on. And almost instantly, my success rate with my MF lenses started to improve.


  • 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!
50mm f1.4 lens, camera, da, f2, focus, kit, lens, pentax help, photography, photos, picasa, smc, smc m 50mm
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: K-mount Tamron-F 2x Pz-AF BBAR MC7 TC, TWO 50mm SMC-M F1.4, and a 50mm SMC-A F pxpaulx Sold Items 11 06-14-2010 07:42 AM
16-50mm/2.8 SMC lens.. redmonarch Ask B&H Photo! 11 06-11-2010 04:04 PM
For Sale - Sold: [US] SMC Pentax-M 2.8 28mm Lens, SMC Pentax-A 1.7 50mm soundview Sold Items 4 02-15-2010 02:39 PM
Wanted - Acquired: SMC-M 50mm F1.7 lens clatrell Sold Items 0 01-03-2010 04:38 PM
Lens hood on smc-m 50mm. deudeu Pentax SLR Lens Discussion 7 05-28-2008 05:00 AM

All times are GMT -7. The time now is 12:52 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]