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. > >> 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 > > > -- > 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.
