Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "paul stenquist" <[email protected]>
Subject: Re: k-5 autofocus fine adjustment
On Nov 7, 2010, at 5:19 PM, Ken Waller wrote:
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message ----- From: "paul stenquist"
<[email protected]>
Subject: Re: k-5 autofocus fine adjustment
My autofocus wouldn't seem to have any front/rear autofocus problems
either. Those plus or minus two or >three click adjustments are
extremely small changes and aren't apparent in the focusing screen.
So the evaluation was done on your monitor ?
Yes. At 100%. I think that's the only way to do it accurately.
My thoughts also.
But fine adjustment is worth the effort. I don't think any autofocus
system is spot on with all lenses from the >factory. The variation is
generally in the lens construction, and I suspect that lenses change a
bit over time >with wear and settling of parts. I wouldn't use a new
camera for serious business without first calibrating the >autofocus.
Paul
On Nov 7, 2010, at 1:29 AM, Boris Liberman wrote:
Fascinating, Paul. Except just one lens, the seller of which
forewarned me of necessity to align focus, all my >lenses and cameras
are spot on in AF department. I did not perform any calibration or
scientific (semi->scientific, quarter-scientific?!) tests, but judging
from rather accurate (in case of K-7 even properly shimmed >and
calibrated by testing) Katz Eye screen, my gear doesn't have any
front/back focus problems whatsoever. >Curious, really.
Clarification: I am talking about center AF point.
Boris
On 11/7/2010 3:42 AM, paul stenquist wrote:
I adjusted the camera for all six of my autofocus lenses this
morning. i did it with the target I've used before. The moire method
sounded even more difficult and time consuming. In any case, five of
the six came in at 2 or 3 clicks in one direction or the other. None
were dead on at zero. That's less deviation than I saw with most of
my other Pentax DSLRs. Similar to what I saw with the K-7. One lense,
the FA 35/2 required a + 10 adjustment. I believe the K-7 number for
that lens was way up there as bell. I'll have to have a look. I
double and triple checked most of them. Checked zooms at full zoom
and half way. If there was a discrepancy, I leaned toward getting it
right at the longer focal length, since DOF is reduced. I'm now
happily dialed in.
Paul
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