ahhhhhh. Right, my DL can't do that but i think the K10D can Quoting Paul Stenquist <[EMAIL PROTECTED]>:
> You don't combine them in Photoshop. You multiple expose the same > image in the camera. > Paul > On Oct 31, 2006, at 8:53 PM, [EMAIL PROTECTED] wrote: > > > Please excuse my ignorance, but how exactly do you stack them in > > Photoshop? I'm > > familiar wit combining images of different exposures, but how > > exactly would this > > work? > > > > Quoting Tom C <[EMAIL PROTECTED]>: > > > >> It's when you combine virtually identical multiple exposures, > >> "stacking" > >> them to reach a final image that has a total exposure time equal > to > >> the sum > >> of the individual exposures. > >> > >> It's useful in astrophotography for a number of reaons. The main > one > >> is > >> that a bunch of short, say 6 individual 30 second exposures, can > be > >> combined > >> The result is the accumulated photons of a 3 minute exposure. > The > >> neat > >> thing is that tracking error (irregularities in the motor drive > or > >> polar > >> alignment) can be virtually eliminated, because software > >> automatically > >> aligns/registers the individual images so they overlay each other > >> perfectly. > >> > >> The additional benefit we're talking about here is that the > sensor > >> can be > >> run at both a lower ISO and for a shorter exposure duration, both > of > >> which > >> reduce noise. > >> > >> Tom C. > >> > >> > >> > >> > >>> From: "Shel Belinkoff" <[EMAIL PROTECTED]> > >>> Reply-To: Pentax-Discuss Mail List <pdml@pdml.net> > >>> To: "Pentax-Discuss Mail List" <pdml@pdml.net> > >>> Subject: Re: K10D aimed as D200 killer/Translation of interview > >>> Date: Tue, 31 Oct 2006 15:38:30 -0800 > >>> > >>> What's a "stacked image?" > >>> > >>> Shel > >>> > >>> > >>> > >>>> [Original Message] > >>>> From: Tom C > >>> > >>>> It also is likely possible to reduce > >>>> overall noise by shooting at shorter > >>>> exposure times and stacking images. > >>>> The stack will stack up noise just like > >>>> it does with the signal, but if each > >>>> stacked image is less than half as > >>>> noisy as it's double-ISO cousin, > >>>> results could be favorable. > >>> > >>> > >>> > >>> -- > >>> PDML Pentax-Discuss Mail List > >>> PDML@pdml.net > >>> http://pdml.net/mailman/listinfo/pdml_pdml.net > >> > >> > >> > >> -- > >> PDML Pentax-Discuss Mail List > >> PDML@pdml.net > >> http://pdml.net/mailman/listinfo/pdml_pdml.net > >> > >> > >> > > > > > > > > -- > > PDML Pentax-Discuss Mail List > > PDML@pdml.net > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
