The Rosette Nebula in Hydrogen Alpha
Rosette Nebula

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