Yeah?... Again, "I'm happy to leave it there." Jack
--- On Mon, 12/6/10, paul stenquist <[email protected]> wrote: > From: paul stenquist <[email protected]> > Subject: Re: Latest Pentax Scare: Blobs on K-5 Sensor > To: "Pentax-Discuss Mail List" <[email protected]> > Date: Monday, December 6, 2010, 8:29 PM > > On Dec 6, 2010, at 11:06 PM, Jack Davis wrote: > > > I imagined that the spots would be considerably more > prominent than paper texture.(?) > > My feeling is, however, that isolated small detail > would fuzz out quickly in poor focus, but I'm happy to leave > it there. :) > > The sensor is behind the lens. It's focus independent, > although light focused at f22 is more likely to reveal > details on the sensor than would light focused at f8. > Paul > > > > Jack > > > > --- On Mon, 12/6/10, P N Stenquist <[email protected]> > wrote: > > > >> From: P N Stenquist <[email protected]> > >> Subject: Re: Latest Pentax Scare: Blobs on K-5 > Sensor > >> To: "Pentax-Discuss Mail List" <[email protected]> > >> Date: Monday, December 6, 2010, 2:53 PM > >> goodly out of focus:-). When trying > >> to detect spots on the sensor, you want only a > white surface > >> in front of the lens. Focusing on the surface is > >> counterproductive in that you pick up more of its > texture. > >> > >> Paul > >> On Dec 6, 2010, at 5:00 PM, Jack Davis wrote: > >> > >>> Badly OOF? > >>> > >>> Jack > >>> > >>> --- On Mon, 12/6/10, P N Stenquist <[email protected]> > >> wrote: > >>> > >>>> From: P N Stenquist <[email protected]> > >>>> Subject: Re: Latest Pentax Scare: Blobs on > K-5 > >> Sensor > >>>> To: "Pentax-Discuss Mail List" <[email protected]> > >>>> Date: Monday, December 6, 2010, 1:52 PM > >>>> > >>>> On Dec 6, 2010, at 4:36 PM, Miserere > wrote: > >>>> > >>>>> On 6 December 2010 16:31, P N > Stenquist <[email protected]> > >>>> wrote: > >>>>>> > >>>>>> On Dec 6, 2010, at 4:16 PM, > Miserere > >> wrote: > >>>>>> > >>>>>>> On 6 December 2010 16:03, > paul > >> stenquist > >>>> <[email protected]> > >>>> wrote: > >>>>>>>> > >>>>>>>> On Dec 6, 2010, at 3:33 > PM, > >> Charles > >>>> Robinson wrote: > >>>>>>>> > >>>>>>>>> On Dec 6, 2010, at > 14:19, > >> Miserere > >>>> wrote: > >>>>>>>>> > >>>>>>>>>> Any of you guys > with a > >> K-5 > >>>> experiencing any of this? > >>>>>>>>>> > >>>>>>>>>> http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=37092371 > >>>>>>>>>> > >>>>>>>>>> http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=37101106 > >>>>>>>>>> > >>>>>>>>>> Maybe you K-7 > owners could > >> take a > >>>> look too. No need to transfer test > >>>>>>>>>> images to the > computer, > >> the blobs > >>>> can be seen on the LCD. > >>>>>>>>>> > >>>>>>>>> > >>>>>>>>> Frankly, if the images > turn > >> out OK > >>>> (besides being all green) then there is > no > >> problem. > >>>> Interesting as a curiosity, but not in a > "OMG the > >> sky is > >>>> falling" kind of way. > >>>>>>>>> > >>>>>>>>> Seriously... why would > a > >> person even > >>>> bother looking for something like this > unless it's > >> affecting > >>>> the output? > >>>>>>>>> > >>>>>>>>> And by "affect the > output" I > >> mean: can > >>>> this really be SEEN on something other > than an > >> f/22 shot of > >>>> a blank grey surface? > >>>>>>>> > >>>>>>>> It could be seen on any > number of > >> small > >>>> aperture shots. I'm definitely going to > test for > >> it. > >>>>>>>> Paul > >>>>>>> > >>>>>>> Thanks for the replies so far, > and > >> please keep > >>>> 'em coming. > >>>>>>> > >>>>>>> My test unit has a string of > blobs > >> near the > >>>> center (most people seem > >>>>>>> to report them "near the > center" for > >> what it's > >>>> worth). They are > >>>>>>> noticeable at f/8 and smaller > when > >>>> photographing a blank surface; I > >>>>>>> suspect in real photographs > (with > >> plenty of > >>>> detail) they should > >>>>>>> *maybe* be noticeable at f/11 > and > >> onwards. I > >>>> rarely photograph at such > >>>>>>> apertures, but I can imagine > people > >> shooting > >>>> landscapes would be > >>>>>>> annoyed to find these blobs in > their > >> blue > >>>> skies. Then again, a blob in > >>>>>>> a blue sky is easy to clone > out. Then > >> again, > >>>> again, we'd all prefer > >>>>>>> not to have to clone out blobs > as part > >> of our > >>>> postprocessing. > >>>>>>> > >>>>>>> > >>>>>> > >>>>>> I just tested my camera in the > same manner > >> as the > >>>> guy reported on dpreview. I filled my > computer > >> screen with > >>>> white and shot it with my DA* 16-50 at > about 30mm, > >> F stops > >>>> were f22, f16 and f11. Focus set to > infinity. No > >> blobs. Saw > >>>> a few specs of dust, Did the sensor clean > >> operation and > >>>> retested, and the dust was gone. I get > pure > >> white. > >>>>>> Paul > >>>>> > >>>>> That's good news, Paul. > >>>>> > >>>>> For what it's worth, my blobs are much > better > >> defined > >>>> using the sky or > >>>>> a blank piece of paper than the > computer > >> screen. Not > >>>> sure why anyone > >>>>> would want advice on improving their > blob > >> definition, > >>>> but it's one of > >>>>> the many useful services I provide to > the > >> community. > >>>>> > >>>>> Because giving back is important. > >>>>> > >>>> I repeated the test with white paper. > Still no > >> blobs at > >>>> f22. Just out of focus paper. > >>>> Paul > >>>>> > >>>>> —M. > >>>>> > >>>>> \/\/o/\/\ --> > http://WorldOfMiserere.com > >>>>> > >>>>> http://EnticingTheLight.com > >>>>> A Quest for > >> Photographic Enlightenment > >>>>> > >>>>> -- > >>>>> 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. > >> > >> > >> -- > >> 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. > -- 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.
