RE: [APML] Schmidt Shot: IC443 to NGC2174

[Alan Voetsch <alanv12952@yahoo.com>]

I know Chris. After shooting Supra for several years, I realized that
that was what I was referring to. It wasn't too bad at f/8 or f/10, but
if I goofed around in PS with it, it would get real bad. Especially
seeing as I never have any idea what it is I'm doing, and what the
consequences might be. I think the film is getting old making the
situation worse. That's one reason why I sold off my stock and am now
trying different films. I really don't recall this effect happening a
couple years ago, but that may be becasue I was not as critical then.

I wonder if taking more, but shorter exposures would help? Say 4, four
minute shots instead of 2, 8 minute shots. Or 6 minute shots. Have you
tried that?

Alan 

--- Chris Schur <cschur@therim.com> wrote:
> Alan, One fact of the supra film is that the halation is very bad. 
> This
> causes red halos around nearly every star in the schmidt.  The reason
> is the
> fast light cone disperses rapidly away from the star causing the
> halos.  Why
> the red layer Im not sure, but thats the way it is. 


SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
& http://www.pbase.com/avoetsch12952/fs102
& http://www.pbase.com/avoetsch12952/takpf


		
__________________________________ 
Do you Yahoo!? 
Yahoo! Small Business - Try our new resources site!
http://smallbusiness.yahoo.com/resources/ 
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo