Re: [APML] Re: First M31 Prime Focus

Thanks Renzo! No, it's not my first, just my first galaxy. Unfortunately my 80mm achromat exhibits strong vignetting on long prime focus shots. I'm still trying to learn how to deal with that through gradient masks, Background Subtraction Toolkit, and the lasso tool. I'm going to try it again and use your suggestions. I checked out your image and I don't expect mine to look that good but I think I can get it better. Thanks again.

Gary

----- Original Message -----

From: Renzo Del Rosso

To: Discussion of Film Astrophotography

Sent: Tuesday, October 19, 2004 12:42 PM

Subject: [APML] Re: First M31 Prime Focus

GARY HATFIELD Scrive:

> I want to post 3 new shots. The M31 prime focus is my first attempt at a galaxy.

If it is your first attempt at the prime focus I send you my compliments.

I think you can process better the pic, because there are many further
informations.
You can try to use the curve of PS (62/120) and the a unsharp mask
(200/0,8/23).

This only a start ...

Pay attention. I use this parameters with your photo but it is too clipped
on dark.
Probably the original must process in different way, but, I repeat, this is
a start.
You can view "my M31" in my web site, under fotografie - profondo cielo.
Clear skies
Renzo

www.renzodelrosso.com
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