Andreas, I have no experience with the K20D, but when I used the 1.1 firmware to adjust the focus on my K10D (which was back-focusing), it benefitted all of my lenses. It has made the camera much more rewarding to shoot with.
There is a definite tendency toward hysteria (not to mention hyper-obsessive pixel-peeping, leading to hysteria) on both PentaxForums and DPR. Many people there just need to take a deeeeeeep breath and go out and shoot. I may be able to take you up on that beer in late June. Rick --- Andreas Pfotenhauer <[EMAIL PROTECTED]> wrote: > hi, > > i recently followed a discussion in my favorite > forum (bulletin board?) > where a guy who had bought a DA 35/2.8 Limited was > very disappointed > because he found the *lens* to have severe back > focus on his K10D while > on his K20D it seemed to work just fine. > > As far as i understand it (with my limited optical > knowledge), a lens > can (and does) produce various forms ob optical > aberrations, but if the > "virtual image" is not directly on the sensor but in > front or behind, > then it's simply not properly focused, isn't it?! So > the AF of the > camera would be to blame for not acting accurate or, > as second > possibility, sensor, AF sensor and/or focusing > screen are not leveled. > I was asking if someone with a deeper understanding > of the optics could > confirm or denial this, but no one was able (or > wanted) to, thats why > I'm asking here now :-) > > The reason why I'm so interested in this is: a > increasing number of ppl > in that forum now test their newly bought lenses > with a printed test > chart under more or less undefined light conditions, > of course they find > some back- or front focus (of you look hard enough > you surely find > something to worry about, I'm 100% convinced), and > then they send their > lenses back, open new threads in the forum where > they loudly complain > about lens qualities, unsettle some more who start > testing their lenses > ... you get the drift. > > I would be deeply grateful if someone could shed a > light on this, so > this can be settled once and for all. > > Free beer is offered if that one will ever visit > Frankfurt, Germany ;-) > > cheers > Andreas > > > -- > 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. > http://www.photo.net/photos/RickW ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ -- 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.
