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!

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M13 (Great Cluster in Hercules)   [obsolete]

Image Details:

Camera: Canon Digital Rebel (300D)
Mount: Celestron AS-GT
Scope: Celestron C8-N (8" f/5 Newtonian)
Configuration: Negative Projection (Barlowed)
Additional Optics: TeleVue 2x Barlow
Filter: None
Effective Focal Length: 2844mm
Effective Focal Ratio: f/14.2
Exposure: 12 x 1min @ ISO 3200
Total Exposure: 0hrs, 12min
Date: 6/23/2004 12:52am PDT (start)
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: None

Processing:

  • IRIS: Dark subtraction, flat field, registration, stacking, Richardson-Lucy Deconvoultion (5 iterations), AF5 Noise Reduction
  • Photoshop: Image scale (1/4x), JPG conversion

Image Description:

This magnification pushes the limits of my mount, especially without [auto]-guiding. Only 12 of the 32 frames were useable. The rest showed severe smearing/trailing and had to be tossed. This is a scaled version of the full-size frame. North is up.

 
M86 (Part of Markarian's Chain)
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:

M86 (Part of Markarian's Chain)

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: 12 x 60sec @ ISO 400
Total Exposure: 0hrs, 12min
Date: 5/13/2004, 1:30am PDT
Location: Saratoga, CA, USA
Acquisition: Manual
Focus: DSLRFocus
Dithering: None
Guiding: None

Processing:

  • IRIS: Dark subtraction, flat frame, registration and stacking
  • Photoshop: Noise reduction, image scale (1/4 x), JPG conversion

Image Description:

This is a portion of a string of galaxies in the constellation of Virgo known as Markarian's Chain. North is up.

 
IC 1848 (Soul 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:

IC 1848 (Soul 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: Orion ED80 (80mm f/7.5 APO Refractor)
Configuration: Focal Reduced
Additional Optics: William Optics 2" APO 0.8x Reducer/Field Flattener
Filter: None
Effective Focal Length: 480mm
Effective Focal Ratio: f/6
Exposure: 23 x 8min @ ISO 800
Total Exposure: 3hrs, 4min
Date: 12/5/2005 10:06:54 PM PST (start)
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, ASINH stretching
  • Photoshop: Levels, cropping, JPG conversion

Image Description:

This is IC 1848, aka, the Soul Nebula in the constellation of Cassiopeia. Like others, I think this object's shape is more reminiscent of a fetus, or even of the Star Child in 2001: A Space Odyssey.

This image is "first light" with the William Optics focal reducer, which appears to be the best match for the ED80 as determined by my ED80 Focal Reducer Shootout. I'd say it does a mighty fine job.

This image isn't bad, but could probably use more exposure. It dawned on me only after the fact that 3hrs of f/6 is equivalent to only 2hrs at f/5. Another night perhaps. A higher-resolution image is also available. North is up.