Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
12-04-2012, 02:06 PM   #16
Inactive Account

Join Date: Sep 2012
Posts: 2
My experience backs up what the TO has found out. Having read about the diffraction figures relevant to the Q (on Photozone, for example), I had assumed that it would be best to use long lenses wide open. But in test shots I found that the M*300 performed better at 5.6 than at 4. I shot the Sigma telemacro 400 at 5.6, 8 and 11 and got the best results at f8. So it seems to be very much a case of finding what works best with any particular lens.

12-05-2012, 10:49 PM   #17
Site Supporter
vagrant10's Avatar

Join Date: May 2007
Location: portland
Photos: Albums
Posts: 1,362
very interesting test; thanks for posting and doing this!
12-05-2012, 10:59 PM   #18
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
I can confirm (now that I read the manual for the Pentax adapter and found the translation scale) that the DA*300 looks best on the Q around 5.6 (#1 stop), and also the Sigma 70-200 performs nicest at 5.6 (#2 stop).

I use the DFA 100WR primarily for macro on the Q, so to maximize DOF I use it at f8 or f11, but it is sharpest closer to f4.

  • 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!
aperture, camera, diffraction, f2.4, f5.6, lenses, mirrorless, pentax q, pentax q10, pentax q7, q10, q7, smc-a
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
K5ii diffraction correction climit Pentax DSLR Discussion 2 11-17-2012 10:20 AM
Landscape Dark Hollow Falls (with diffraction?) LFLee Post Your Photos! 2 10-17-2012 05:15 PM
Hyperfocus and diffraction help. ladybug Troubleshooting and Beginner Help 14 05-13-2012 05:05 PM
Diffraction limiting? grhazelton Pentax Medium Format 19 03-29-2012 10:02 PM
blue/red channel diffraction test Nass Digital Processing, Software, and Printing 5 09-01-2011 07:48 AM

All times are GMT -7. The time now is 11:12 AM. | 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]