Waning Gibbous Moon
Date: October 1, 2004
Sky 90 at f9 with the Extender-Q focal extender, on the G11 Losmandy
Autoguider: SBIG STV with
Ha filter (13 nm bandpass); Astronomik RGB type II filter set.
Exposures: Hydrogen alpha- 1 x
0.007" exposure. (I took 40 sequential exposures of 0.007" each
through the Ha filter and chose the best for subsequent processing).
Conditions: Temperature 52 degrees F; poor
transparency; good seeing as fog descended into region, calm.
Post-processing: No dark, bias, or flat frames used. All levels and
curves adjustments performed in Photoshop. Lucy-Richardson
deconovultion performed in ImagesPlus. This
image was taken with the
Extender-Q focal extender coupled to the Sky90, which converts it from
f5.6 (focal length 504mm) to f8.9 (effective focal length 810mm).
The FOV with this set up is about 28 x 38
arcminutes, with an image scale of 1.63 arcseconds per pixel.
note: Graphics on this website
may not be reproduced without author permission.
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