Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)

["Kevin Wigell" <kwemail@twcny.rr.com>]

Rob, CCDSharp will only read FITS or SBIG formats, correct? How do you get 
your file into one of those formats so that CCDSharp can read it?

Kevin Wigell
www.kwastronomy.com

----- Original Message ----- 
From: "Robert Gendler" <robgendler@worldnet.att.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, March 12, 2005 8:04
Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)


> Bobby,
> Deconvolution algorthms are complex mathematical formulas that
> try to approximate what the image would look like without the blurring
> effects brought on by seeing, mechanical and optical issues. Its much
> more than a sharpening filter. It does an amazing job of tightening an 
> image
> but does come at a cost. The image needs to have good S/N as decon
> will bring out noise in the image, particularly the background (mottling).
> The stars will also acquire halos with aggressive decon. One thing I 
> should
> mention is that for an image to respond well to decon it must be 
> oversampled
> which is another way of saying it needs to be taken at long focal length, 
> at
> least 2000mm. There are ways to deal with the noise such as making a layer
> with a nondecon frame to replace the background and stars. The Lucy
> Richardson algorthms IMO are the best. I use CCDSharp (now free off
> the SBIG site). I hope this helps.
>
>
> Rob Gendler
> email: robgendler@att.net
> Web Site: http://www.robgendlerastropics.com


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