IMO a flat or even angled surface is a bad test. For starters the AF point on the k7/k5 is the size of the center circle. If you are calibrating a k-3 you should have an easier time. I always try to get an edge in focus and work from there. Close focusing seems to reveal the deficiencies the easiest because dof is shallower. Placing some objects in front of and behind your subject should reveal front or back focus. If you are moving between -10 and +10 and not seeing a difference you need to find some subject that will show you movement.
On Sun, Dec 22, 2013 at 12:14 AM, Alan C <[email protected]> wrote: > Having read this thread, I can only conclude that either I am dof or there > is some some trick to being successful with this procedure. > > Last week I decided to fine tune my identifiable lenses on the K7. I used > Bob Atkins grid, set the lenses at their widest aperture & worked as close > as I could get. With each lens, I took shots at -10, -5, -2, 0 +2, +5 &+10. > Well, with all lenses, there is absolutely no difference between the shots. > > OK, so I figured it was because they are slow consumer lenses and decided to > try it with my Super Tak 50/1.4 - same result. > > I read on the web that the "apply one" settings can override the "apply all" > settings and vice versa so I tried setting both with the same value. Still > no luck. > > I also came across a program called "PK_Tether" which allows one to control > the camera from a PC. Apparently it allows adjustments from -100 to +100! I > downloaded it & it connects to the camera OK but am a bit reluctant to try > it. Any comments on that? > > Alan C > > -----Original Message----- From: Paul Stenquist > Sent: Saturday, December 21, 2013 7:08 PM > To: Pentax-Discuss Mail List > Subject: k-3 fine focus adjustment > > > I finally got around to running some of my autofucus lenses through fine > focus adjustment. The DA* 50-135 and DA* 60-250 were just about right on. > Splitting hairs, I went for +1 on each. The FA 35/2 required +2 as did the > FA 50/1.4. The our of the box focus was much closer than any other Pentax > digital I've owned. Each generation was an improvement over the last. > > Paul > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
