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. :)
Jack --- On Mon, 12/6/10, P N Stenquist <pnstenqu...@comcast.net> wrote: > From: P N Stenquist <pnstenqu...@comcast.net> > Subject: Re: Latest Pentax Scare: Blobs on K-5 Sensor > To: "Pentax-Discuss Mail List" <pdml@pdml.net> > 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 <pnstenqu...@comcast.net> > wrote: > > > >> From: P N Stenquist <pnstenqu...@comcast.net> > >> Subject: Re: Latest Pentax Scare: Blobs on K-5 > Sensor > >> To: "Pentax-Discuss Mail List" <pdml@pdml.net> > >> 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 <pnstenqu...@comcast.net> > >> wrote: > >>>> > >>>> On Dec 6, 2010, at 4:16 PM, Miserere > wrote: > >>>> > >>>>> On 6 December 2010 16:03, paul > stenquist > >> <pnstenqu...@comcast.net> > >> 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 > >>> PDML@pdml.net > >>> 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 > >> PDML@pdml.net > >> 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 > > PDML@pdml.net > > 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 > PDML@pdml.net > 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 PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
