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| Optics | Pentax 75 |
| Focal Lenght | 500mm |
| Focal Ratio | f/6.7 |
| Exposure Time | 45 min
(single
exp of 5 min) |
| CCD | Canon EOS 5D
with baader filter |
| Location | Pian
dell'Armà (PV,
Italian Appennines) at 1450 m height |
| Date |
10 Dec 2010 |
| Mount | Gemini G-41 |
| Tracking | Lodestar on a
80mm
f/5 refractor |
| Temperature and humidity | T= -1 °C,
RH=41% |
| Sky brightness at zenith (with SQM-L) | 20.8 mag/arcsec^2 |
| Notes | Moon above
horizon. Diffraction spikes obtained with two rubber bands in front of the objective |
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