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. 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.
