Re: [APML] 7331 (again!)

["Joseph Dartsum" <jdartsum@hotmail.com>]

>From: Tonyhallas@aol.com
>Reply-To: astro-photo@seds.org
>To: <astro-photo@seds.org>
>Subject: Re: [APML] 7331 (again!)
>Date: Sat, 22 Sep 2001 00:41:19 EDT
>
>Hello everyone,
>
>     Last night I used TWO HOUR hypered Kodak Royal Gold 200 @ 90 minute 
>exposures of 7331 (great test object) and recorded a LOT more than the 
>previous negatives. Tracking was very good, as was the focus this time. I 
>"polluted" these better negatives with the original Picture Window result 
>and came up with a new image and a close up.. you can see H II regions and 
>galaxies everywhere... in the close up, the companion galaxy to the upper 
>left even has two faint H II regions showing. As the signal to noise ratio 
>is increased through PW more detail and color is showing up... almost CCD! 
>:-)

??

Can you describe your definition of signal to noise ratio, and what 
operations in Picture Window contribute to increasing it?

I read your fine article in a past issue of Sky and Telescope, where you 
described signal to noise ratio.  I need a refresher, from the expert 
himself.

That image sure looks good..


J. Dartsum
>
>You can see these at:
>
>http://www.astrophoto.com/7331.htm
>
>and:
>
>http://www.astrophoto.com/7331CU.htm
>
>      Tonight I am taking the LAST images of this galaxy in an attempt to 
>repeat last night's results... then I will have four really good negs to 
>work from. This has been a real learning experience...
>
>       Tony
>
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