On 07/02/07, jim <[EMAIL PROTECTED]> wrote: > On Wed, 7 Feb 2007 00:22:25 +0100, Patrick Genovese wrote: > > I have found that with long exposures, the NR takes a long time to do it's > thing. almost as long as the exposure itself depending on what shutter speed > used. > So I turn NR off for long exposures > (thanks again Thibouille)
Hopefully it should take as long as the exposure plus a very small amount of time for processing otherwise it's not working. Dark frame subtraction (which the integrated NR is) is very effective at reducing the effect of fixed noise sources but the random noise component will increase slightly. http://en.wikipedia.org/wiki/Dark_frame_subtraction http://astro.corlan.net/gcx/html/node10.html#SECTION001030000000000000000 -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
