SaratogaSkies Jim Solomon's Astropics

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December: Test shots with new scopes/mounts

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NGC 7000 & IC 5070 (North American & Pelican Nebulae Widefield)

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: Canon EF 200mm f/2.8L II USM lens
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 200mm
Effective Focal Ratio: f/2.8
Exposure: 46 x 4min @ ISO 800
Total Exposure: 3hrs, 4min
Date: 9/29/2005 PM 9:01:03 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 a widefield shot of the North American Nebula (NGC 7000, left) and the Pelican Nebula (IC 5070, right), two emission nebulae in the constellation of Cygnus. This is one of my best widefield images to date. Lots of exposure time and really nailing the focus (always a challange at f/2.8) certainly helped. Mouse over the image to see the annotations. A higher resolution image is also available. North is up.

 
NGC 6960 (Cirrus Nebula)
SaratogaSkies Jim Solomon's Astropics

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Latest news

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 6960 (Cirrus Nebula)

[Hα+R G B]

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: Hutech Hα Front Filter (HA-FF)
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 30 x 8min @ ISO 400 (RGB), 30 x 8min @ ISO 1600 (Hα)
Total Exposure: 8hrs, 0min
Date: 9/17/2006 (RGB); 9/19/2006 (Hα)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: GADFly 1.0.5
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, HαRGB combination, ASINH stretching
  • Photoshop: Levels, cropping, sharpening, JPG conversion
  • Neat Image: Noise reduction

Image Description:

This is NGC 6960, aka the Cirrus/Filamentary/Lace-work Nebula and the Western portion of the Veil Nebula, a supernova remnant in the constellation of Cygnus. This image consists of 4hrs of RGB exposure and 4hrs of Hα exposure over two nights.

Unlike my previous Hα+R G B images, in this one I used Hα for Luminance, and the RGB data for color after first blending a smidgeon of Hα into the Red channel. I suppose that makes this technically an Hα:Hα+R:G:B image. Using Hα for Luminance gives a very high contrast result, with added benefit of attenuating the star field which otherwise tends to overwhelm the rather faint nebula. And blending a bit of Hα into the Red channel prevents the salmon-i-zation (salmonella!? <g>) — i.e., the washout — of the red region that results from simple luminance layering in Photoshop. Robert Gendler has an explanation of this technique at his web site. Mousing-over the image shows the RGB stack, without any of the Hα data. Notice how the Veil tends to get lost in the Milky Way star field in that RGB-only image.

A higher-resolution image is also available. North is left.

 
NGC 6960, NGC 6992, NGC 6995 (Veil Nebula Widefield)
SaratogaSkies Jim Solomon's Astropics

Search

Latest news

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 6960, NGC 6992, NGC 6995 (Veil Nebula Widefield)

[Hα+R G B]

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: Canon EF 200mm f/2.8L II USM lens
Configuration: Prime Focus
Additional Optics: n/a (Prime)
Filter: None
Effective Focal Length: 200mm
Effective Focal Ratio: f/2.8
Exposure: 45 x 4min @ ISO 200
Total Exposure: 3hrs, 0min
Date: 9/27/2005 8:30:51 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 a widefield shot of the Veil Nebula, a supernova remnant in the constellation of Cygnus. Even with 3hrs of exposure, this faint nebula tends not to stand out very well from its rich background of Milky Way stars. A higher resolution image of this widefield shot is also available, as is a closeup of NGC 6992 (the Eastern portion) from last year. North is up.