SaratogaSkies Jim Solomon's Astropics

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December: Test shots with new scopes/mounts

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Dec 3: AP1200 Arrives!

Nov 30: TMB 152/1200 Arrives!

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M51 (Whirlpool Galaxy)

[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: 31 x 4min @ ISO 400 (RGB), 23 x 8min @ ISO 1600 (Hα)
Total Exposure: 5hrs, 8min
Date: 5/11/2005 11:28:24 PM PDT (RGB); 6/16/2006 10:11:42 PM PDT (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, HαRGB Combination, White balance, ASINH stretching
  • Photoshop: Sharpening, Levels, cropping, JPG conversion
  • Neat Image: Noise reduction

Image Description:

This is M51, aka the Whirlpool Galaxy in the constellation of Ursa Major. This is Third Light <smile> for my Hutech Hα Front Filter (HA-FF). For RGB data, I used my M51 image from last year, taken with an unmodified 300D. The image above is that same image with ~3hrs of Hα taken with the modified 350D. The Hα regions are the small, cherry-red regions in the spiral arms of M51. Note that mousing-over the above image, in addition to displaying the object labels, will switch back-n-forth between the HαRGB image and the standard RGB image, very clearly showing the effect of the additional Hα data. See the full-resolution image for a better view of these regions. North is up.

 
M16 (Eagle Nebula)
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:

M16 (Eagle 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: None
Effective Focal Length: 1000mm
Effective Focal Ratio: f/5
Exposure: 28 x 4min @ ISO 400
Total Exposure: 1hrs, 52min
Date: 8/28/2005 9:01:59 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
  • JimP: Flat field, Kappa-Sigma Stacking, White balance, ASINH stretching
  • Photoshop: Levels, sharpening, cropping, JPG conversion

Image Description:

This is a "do over" of M16, the Eagle Nebula, in the constellation of Serpens. M16 (NGC 6611) actually refers to the open cluster of bright, white, stars just above and to the right of the center of this photo. IC 4703 is the catalog name given to the nebula in which these bright, young stars continue to be born. The Modified camera did an excellent job at capturing the Hα (deep red) color in the nebula, while not obscuring the greenish tones in the upper-right regions. My previous attempt at M16 is still available, that one with an unmodified camera. This is the full frame, shrunk for display on the web. A full-resolution image is also availble. North is up.