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Optics | Pentax 75 |
Focal Lenght | 500 mm |
Focal Ratio | f/6.7 |
Exposure Time | 40 min
(single
exp of 10 min) |
CCD | Canon EOS 5D
with baader filter |
Location | Pian
dell'Armà (PV,
Italian Appennines) at 1450 m height |
Date |
11 Dec 2010 |
Mount | Gemini G-41 |
Tracking | Lodestar on a
80mm
f/5 refractor |
Temperature and humidity | T= +3 °C,
RH=40% |
Sky brightness at zenith (with SQM-L) | 20.6 mag/arcsec^2 |
Notes | Moon above
horizon. Diffraction spikes obtained with two rubber bands in front of the objective. |
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