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NGC 6888 - The Crescent Nebula - Emission Nebula in Cygnus
by Bob and Janice Fera
Officina
Stellare RC-360AST 14" f/8 Ritchey Chretien Cassegrain
with two-element field flattener
Apogee Alta U16M CCD Camera
Astrodon Filters
Ha-OIII-RGB Composite - 300:390:35:35:35 minutes
Sub Exposures: Ha:10x30m OIII:13x30m RGB:7x5m
Image acquired with CCDAutopilot
Processed in CCDstack and Adobe Photoshop
Taken June 21-24, 2014 from Eagle Ridge Observatory, Foresthill, CA
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