RE: [APML] 60 hour exposure

["Chris Schur" <cschur@cybertrails.com>]

John has done a very fine processing job on this one, I would ask if the 60
hours was actually reqiured for this depth of image, or would an exposure
half as long been exactly the same.  Also, a comparison with a 60 hour film
image would be helpful. ;)

Chris Schur

-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of John C. Mirtle
Sent: Saturday, October 26, 2002 4:10 PM
To: astro-photo@seds.org
Subject: [APML] 60 hour exposure


Good grief! Either John Gleason really likes the North America nebula, or he
is trying to set some kind of exposure record! Whichever it is, he has
produced an incredibly detailed H-alpha shot which is worth a look at. A
seamless mosaic of 20 images - very nicely done. For those who wish to stand
in awe - http://www.celestialimage.com/page189.html

Some of us haven't had 60 hours of sky this year....

John Mirtle
Calgary, Ab. Canada


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