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Re: [APML] Re: Star Measuring WAS: Horsehead and Pleiades testshots with 6x9 camera/OAGand BRC

To: <astro-photo@seds.org>
Subject: Re: [APML] Re: Star Measuring WAS: Horsehead and Pleiades testshots with 6x9 camera/OAGand BRC
From: Aplanatic@aol.com
Date: Thu, 20 Dec 2001 19:45:44 EST
Reply-To: astro-photo@seds.org
Sender: owner-astro-photo@seds.org

Tony,

> Bottom line in all of this theory... rare is 
> the night when the seeing will allow 
> theoretical performance... unless you are 
> the HST. 

Good point.  Even with a 1 meter focal length instrument with close to perfect optics, it's very rare to actually acheive the theoretical resolution of the optics + film or optics + CCD combination because of seeing.  If you get ~30 micron star images with a 5" f/8 refractor on color film, you're doing quite well indeed.

Dave Rowe
 

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