On Tue, Jun 15, 2010 at 03:23:26PM -0500, Bob Sullivan wrote: > Charles, > I get your explaination, but I look at the distances and light paths > involved and can't imagine much of an angle at f2.8. The opening is a > lot bigger, but that dirt has to be right on top of the sensor...and > the light gets around it ?!! > Regards, Bob S.
The dust spot isn't "right on top of the sensor" - it's right on top of the fromt surface of the protective piece of glass (and anti-aliasing filter). If the piece of dust is smaller than 1/2.8 times the thickness of that piece of glass there's plenty of light coming around it at f/2.8 -- 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.
