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The Rosette Nebula
[click on the image to see it 2x]
Camera: Apogee U16M
Filter(s): Astrodon 5nm Gen
II H-Alpha
Scope: AP155 F7 w 4" FF
Exposure: 7 x 15 minutes
Flesherton, Ontario, Canada
Feb 20, 2011
Ambient temp -10C; camera temp -35C; Moon just past full
Images captured using CCDSoft5
Images calibrated (darks and flats), aligned and sigma-reject combined
in Maxim
Contrast / Brightness adjustments, Levels, selective HighPassFilter in
Photoshop CS4