Thank you for the info. The noise issue makes a lot of sense but the risk to the sensor as you say sounds like a myth.
Does the sensor heat up aprecably during an exposure? if so that may be the root of the myth possibly with older sensors that used to heat up more than the current crop. Rgds Patrick On 10/20/06, Cory Papenfuss <[EMAIL PROTECTED]> wrote: > > I've heard here and there that such long exposures are not > > reccommended due to risk of damage to the sensor.. Is this true ? > > i've tried a few searches on the subject but could not find any > > conclusive information. > > > In my experience trying to do some astro-photography, a DSLR > doesn't work very well for really long (more than a couple of minutes). > The thermal noise of the sensor really starts becoming a problem. I do > know that for astro stuff, lots of short-term exposures are often stacked > together to reduce the noise. > > As far as damage to the sensor, I've heard that's mostly a myth > and has to do with having enough light to bleach the dyes on the color > Bayer filter on the front end. > > -Cory > > -- > > ************************************************************************* > * Cory Papenfuss, Ph.D., PPSEL-IA * > * Electrical Engineering * > * Virginia Polytechnic Institute and State University * > ************************************************************************* > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- Regards Patrick Genovese -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
