> And then the big draw back appeared - the sensors have stains! Arrghhh!!!!!! > How do I discover if there's a problem - by shooting a bright frame into the > light/sky, or...? > > Regards > Jens
Hmm, I have the stains and I am seriously considering NOT taking the camera to be repaired/exchanged. I can see them with the longer lenses closed down to f/11 or more when focused to infinity and pointed at a fairly close uniform thing like a wall. They cannot be seen even with a 200mm lens at f/4 and very faintly at f/5.6 - would be a problem only if I shot .. you guessed .. that same wall. As I am generally not into shooting walls I don't think this will affect me much. Let's take an 18mm lens at f/8 .. I KNOW the stains are there but I also know that noone will be able to see and identify them even on a uniform background. Here is an unedited 10MB (beware) file http://flow.ri-ki.lv/snaps/IMGR0469.JPG Here is a small version for those not really interested in the stains: http://flow.ri-ki.lv/snaps/IMGR0469A.JPG Knowing where those stains are located I can find one (hint they are on the sky - the nice uniform real-life background) and even then only at great magnifications and as a faint shadow. YMMV, I tested by using a 200mm lens at f/22, setting exposure correction to +1, ISO80, uniform 18% gray wall.. sky, ceiling, anything works and your exposure doesn't have to be steady, can even take a really long time - those stains are not going anywhere. If you have them you will be able to see them already in camera at higher magnifications. kris -- 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.
