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RE: [APML] M13 image

Include the Macbeth Color Checker, too.  Their website gives the RGB and/or CMYK of each of the patches.
 
Rich
 
-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On Behalf Of Tony Hallas
Sent: Thursday, June 27, 2002 21:03
To: astro-photo@seds.org
Subject: Re: [APML] M13 image

Jerry,
 
   I guess what I will do is shoot a 21 step grayscale tablet in the moonlight at an f/stop that will allow at least a 20 minute exposure... here we are using a known constant with reflected sunlight. If something is wrong this should show it.
 
      Tony