Re: [APML] Stacking film images

["Bert Katzung" <katzung1@comcast.net>]

Hi Bradley:
Registax is designed for stacking multiple frames from *.avi (webcam) image
files. I'm not familiar with Astrostack but I suspect it has the same goal.
I don't think that they are at all suitable for stacking film images,
although I admit I've never tried.
Stacking of film images: yes, you should expose each frame fully; don't ever
underexpose an astro-image. Are you planning on film images of bright
objects (planets, moon) or deep sky objects (nebulas, galaxies)? Remember
that exposing a deep sky astro image fully means getting the background
"fog" up to the optimal level; you can never get the target object really up
to the levels that you would expect with a daylight target. So stacking film
frames of a deepsky target is always useful as a way of minimizing grain.
Check out Jerry Lodriguss' website and his CD-rom book as well as Robert
Reeve's and Michael Covington's books; all very useful sources for
astro-imaging on film information.
Bert

Bert Katzung
katzung1@comcast.net
www.astronomy-images.com


----- Original Message -----
From: "Bradley Hope" <bradley@thorngarden.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Sunday, 16 November, 2003 12:10 PM
Subject: [APML] Stacking film images


> Good morning;
>
> I've a couple of questions concerning stacking images with film. I know
> there are a couple of free stacking apps, Registax and AstroStack, which
one
> is better? How is the film exposed for stacking, are they fully exposed
> images, or are they intentionally underexposed? Lastly, is there any real
> advantage to be gained by stacking film images other than doing RGB
> exposures and combining?
>
> Thank you and clear skies
>
> Bradley Hope
> http://astronomy.thorngarden.net
>
> No matter where ya go...there ya are.
>
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo

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