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. > -- 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.
