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M20 First LRGB with 7e

Started by sam pitts, 09/29/2002 02:31PM
Posted 09/29/2002 02:31PM Opening Post
This is my first real attempt to do an LRGB with an ST7e NABG. I think I need to expose the blue longer. Does this look like a good focues. Used FS78. Just outside of Eugene, Or

Sam

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Sam

samsastro.com
Posted 09/30/2002 08:47AM #1
You do have some of the blue nebulosity present, but it's weak. If you are imaging from as far north as Eugene, you have significant blue extinction from the atmosphere - this object is low enough to need a significant boost to the blue exposure. I would go at least 150% of the recommended blue exposure (1:1:1.6 would become 1:1.4:2.5, for example, including a boost to the green as well).

Ron Wodaski
author of "The New CCD Astronomy"
http://www.newastro.com

Ron Wodaski
New Astronomy Press
http://www.newastro.com