To Leon and all who replied, I've been busy today with sensor cleaning. I gave the camera's dust removal function many activations. The most troubling spot remains. I bought swabs and used 4-5 to clean the sensor. The most stubborn spot remains, plus I move some other spots around. Here's a full size picture of the worst spot, an 851x565 crop from the full frame. This is really depressing. http://picasaweb.google.com/rf.sullivan/NewK7Samples#5482110879729068482 and a full size picture http://picasaweb.google.com/rf.sullivan/NewK7Samples#5481359232070699890
So do I send it to Pentax next? It will be 1 year old around July 4th. Regards, Bob S. On Sat, Jun 12, 2010 at 8:04 AM, Leon Altoff <leon.alt...@gmail.com> wrote: > Hi Bob, > > It's almost certainly not beneath the filter - if it's right against > the sensor then changing the aperture doesn't make it disappear (it's > the distance between the dust and sensor and the lower angle of the > light that makes the dust disappear as you open the lens aperture). > > Depending on what the tech did at GFM it could be a stubborn bit of > dust or a faulty filter (I had one, it manifested as a fine spray of > dust and was visible only above f11 - fixed under warranty by CR > Kennedy Australia). A check by Pentax would be my suggestion. > > The dust find function only closes the lens to f16 for the test and > ignores anything below a certain size (not sure what it is). It's > useful as a check if you are mainly shooting portraits and other > images with fairly wide open aperture, but if you close down the > aperture a lot then using the highest aperture on your sharpest lens > and examining the image is the best way to find dust. > > Hope this helps > > Leon > > On 11 June 2010 23:23, Bob Sullivan <rf.sulli...@gmail.com> wrote: >> Rob, >> I've tried the dust detect function and it shows nothing - a white >> screen mock-up of the sensor. >> I'm afraid of something beneath the filter assembly and the trouble of >> replacing the camera. >> Thanks for the suggestions as to cause. >> Regards, Bob S. > > -- > 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.
