Har! David Savage wrote: > Speaking of zombies: > > <http://farm3.static.flickr.com/2013/2464490578_2984095914_o.jpg> > > Cheers, > > Dave :-) > > On Tue, May 6, 2008 at 9:51 PM, Paul Stenquist <[EMAIL PROTECTED]> wrote: > >> No? Read more. Those who act without thinking are zombies as far as >> I'm concerned. Now, there are some very intelligent and interesting >> photographers on all of the forums. But the forum structure seems to >> attract the mindless few as well. And it seems just a few zombies can >> cause enough fear to generate mass hysteria. >> >> >> On May 6, 2008, at 9:06 AM, P. J. Alling wrote: >> > I wouldn't call them zombies... >> > >> > Paul Stenquist wrote: >> >> I suspect that back and front focus problems are almost always the >> >> fault of the camera. I too have noticed the hysteria on the Pentax >> >> forum. It's the result of some real problems that have now caused >> >> paranoia and a search for problems where none exist. Some DA* 16-50 >> >> lenses had a manufacturing defect that caused an uneven focal plane. >> >> In other words, the right side of the frame might be in focus, while >> >> the left side was not. This was a lens problem, but it seems to have >> >> been relatively rare and confined to early samples. However, a second >> >> condition has complicated the situation. It seems that early K10D >> >> cameras were not properly set up for USM, and the firmware update >> >> didn't do the job. These cameras backfocused with the USM lenses. >> >> But it's apparently a simple fix, and it's not a lens problem. >> >> However, the mindless zombies on some forums have blown all of this >> >> way out of proportion. As you say, they test every lens, usually >> >> handheld and in questionable conditions, and curse and complain. It's >> >> an ugly situation, although brought on in part by some problems >> >> Pentax created. >> >> Paul >> >> On May 6, 2008, at 7:30 AM, Andreas Pfotenhauer 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. >> >>> >> >> >> >> >> >> >> > >> > >> > -- >> > Vote for Cthulhu. Why settle for a lesser evil... >> > -- Dr. Jerry Pournelle >> > >> > >> > -- >> > 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. >> >> > >
-- Vote for Cthulhu. Why settle for a lesser evil... -- Dr. Jerry Pournelle -- 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.
