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 6543 (Cat's Eye Nebula)

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: 30 x 30sec @ ISO 1600
Total Exposure: 0hrs, 15min
Date: 8/5/2004, 11:30pm PDT
Location: Saratoga, CA, USA
Acquisition: DSLRfocus
Focus: DSLRFocus
Dithering: None
Guiding: None

Processing:

  • IRIS: Dark subtraction, flat field, registration, Kappa-Sigma stacking, Richardson-Lucy deconvolution
  • Photoshop: Cropping, JPG conversion

Image Description:

NGC 6543 is a planetary nebula in the constellation of Draco. I used 10 iterations of Richardson-Lucy deconvolution to bring out the structure in the nebula. I was very careful at every step of the aquisition and processing chain not to clip any of the nebula or its central star, in order to preserve the color and appearance of the nebula. I'm surprised this one came out as well as it did, since the object was in a fairly light-polluted portion of the sky. This is a crop of the full-size image. North is up.

 
Jupiter Moon Animation
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:

Jupiter Moon Animation

Image Details:

Camera: Mofidied Philips ToUcam Pro II (840k): Color RAW Hack
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: 256 x 1/500 sec @ Gain = 10% (Jupiter), 48 frames of 45 x 1/25 sec @ Gain = 27% (Moons)
Date: 7/7/2006, 9:52 PM PDT
Location: Saratoga, CA, USA
Acquisition: Philips VRecord
Focus: Manual
Dithering: None
Guiding: None

Processing:

  • IRIS: AVI conversion, CFA conversion, Registration, Best-frame selection, Drizzle Stacking (2x), Wavelet processing, FFT filtering
  • Photoshop:Compositing
  • Image Ready: Animation

Image Description:

This is a time-lapse animation of Jupiter's moons. Each frame in the animation is separated by 2min of "real time", and consists of a stack of 45 exposures. Properly exposing the moons, however, resulted in an over-exposed Jupiter. So, I shot separate exposures of Jupiter and composited the whole mess in Photoshop, then used ImageReady to assemble the animation. Earth's north is up.