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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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M57 (The Ring Nebula in Lyra) [obsolete]
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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: 13 x 1min @ ISO 3200
- Total Exposure: 0hrs, 13min
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- Date: 6/23/2004, ~3am PDT
- Location: Saratoga, CA, USA
- Acquisition: DSLRfocus
- Focus: DSLRFocus
- Dithering: None
- Guiding: None
Processing:
- IRIS: Dark subtraction, flat field, registration, stacking
- Photoshop: Noise reduction, levels, cropping, JPG conversion
Image Description:
This magnification pushes the limits of my mount, especially without [auto]-guiding. Only 13 of the 32 frames were useable. The rest showed severe smearing/trailing and had to be tossed. This is a crop of the full-size frame. North is up.
In the "trip down memory lane" category, here is an old image I captured back when I first got my scope and borrowed a friend's Nikon D100. This was 20mm eyepiece projection (1910mm, f/9.6), 1 x 2min exposure @ ISO 1600, dark-frame subtracted and processed in Photoshop. I think my technique has come a long way since then!
