I don't test my zooms at every focal length. I tried that on the 12-24, and it drove me crazy. I set them to be right on at the lengths I use most of ten. The scale of focal point adjustment on the K20D is very fine. A bit of variation doesn't seem to be a problem in the real world of taking pictures. Paul On Mar 23, 2008, at 6:37 AM, Carlos Royo wrote: > I understand your frustration, Joseph. But I think that even parfocal > zoom lenses (as opposed to varifocal ones) don't focus the same at all > focal lengths. Expecting them to be perfect, even the high end > ones, is > putting to much faith on technology. > On the other hand, no AF system is perfect. AF can be convenient, and > even faster than manual focus most of the time, but expecting it to be > right on the money all the time is like thinking that auto exposure > always leads to perfect results. > So, if I were you, I wouldn't put much faith on the results of the > lens-body calibration when they return from Pentax. Surely they > will be > able to achieve a better compromise than a user can do at home using > focusing charts, but that's all. > I think you should try Bill's suggestion, it seems to make sense > and see > if results are more consistent. > > Carlos > > -- > 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.
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