Description
John Davis took the tri-color RASA image of the Propeller Nebula (DWB-111), an emission nebula in Cygnus, with a QSI 583 monochrome camera from his Bucksnort Observatory in Texas. This first RASA image of the Propeller is scheduled to appear in the issue of August Sky & Telescope magazine. Total exposure time was 1.3 hours, consisting of 40 minutes H-alpha; 21 minutes luminance; and six minutes each of red, blue, and green. The image is a portion of the 1600 x 1153 pixel original.
The Celestron #93617 RASA LPR (Imaging Filter is highly recommended with the RASA. The scope’s incredibly fast f/2.2 focal ratio gathers so much light so quickly that even modest amounts of sky glow at a dark sky site can brighten the sky background and reduce the contrast in your images. In light-polluted city and suburban locations, the RASA Light Pollution Reduction (LPR) Imaging Filter is a must.
Tech Details:
| Aperture | 11″ |
|---|---|
| Focal Length | 620mm |
| Focal Ratio | f/2.22 |
| Weight | 35 lbs. |
| Resolution | 0.50 arc seconds |
| Warranty | 2 years |
Supplied Accessories:
Dust covers
MagLev cooling fan
Two Losmandy-style “D-plate” dovetails42mm T-thread and 48mm camera adapters
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