SaratogaSkies Jim Solomon's Astropics

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The Moon

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 10 x 1/90 sec @ ISO 100
Date: 8/24/2004, ~8:30pm PDT
Location: Saratoga, CA, USA
Acquisition: Manual
Focus: Manual
Dithering: None
Guiding: None

Processing:

  • IRIS: Registration, stacking
  • Photoshop: Cropping (65%), image size, JPG conversion

Image Description:

This is a colorized version of this moon image, using the technique described in How to capture the color of the Moon. The colors in this image are not invented by processing techniques, though they certainly are accentuated by such techniques. That is, the color is already present, but almost impossible to see under normal circumstances. As the linked article indicates, each color has geological significance, generally indicating the mineral composition of the corresponding region of the moon. The lunar phase here is a 70% waxing gibbous. North is up.

 
NGC 6888 (Crescent Nebula)
SaratogaSkies Jim Solomon's Astropics

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December: Test shots with new scopes/mounts

Dec 21: TMB 80/480 Arrives!

Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

Links:

NGC 6888 (Crescent Nebula)

Mouse-over to see annotations. (Requires Javascript) Click to see high-res version.

Image Details:

Camera: Mofidied Canon Rebel XT (350D): Hutech Type I Filter Replacement
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Prime Focus
Additional Optics: Celestron/Baader Multi Purpose Coma Corrector (MPCC)
Filter: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 20 x 8min @ ISO 400
Total Exposure: 2hrs, 40min
Date: 10/3/2005 10:12:08 PM PDT (start)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: Manual
Guiding: GuideDog via Philips ToUcam Pro II (840k) through Orion ST80 w/ Celestron 2x "Kit" Barlow

Processing:

  • IRIS: Dark subtraction, registration, gradient removal
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, cropping, JPG conversion

Image Description:

This is NGC 6888, aka the Crescent Nebula in the constellation of Cygnus. While the modified camera does an excellent job of capturing Hα, an object like this needs addition Hα-only exposures to improve the contrast against its busy background. Something for another day. A higher-resolution version of this image is also available, as is my previous attempt from last year with an unmodified camera. Note how much more Hα the modified camera records. North is up.