SaratogaSkies Jim Solomon's Astropics


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M101 (Pinwheel Galaxy)   [obsolete]

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 16 x 60sec @ ISO 400 + 16 x 60sec @ ISO 800
Total Exposure: 0hrs, 32min
Date: 5/13/2004 ~3am, and 5/19/2004 ~1:30am
Location: Saratoga, CA, USA
Acquisition: Manual
Focus: DSLRFocus
Dithering: None
Guiding: None


  • IRIS: Dark subtraction, flat field, registration, and stacking
  • Photoshop: Noise reduction, color balance, crop (1/2 x), image scale (1/2 x), JPG conversion

Image Description:

My first attempt at M101, with too little exposure time and no guiding.