M16 and NGC 6604

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Technical Data
Optics Pentax 75
Focal Lenght 500mm
Focal Ratio f/6.7
Exposure Time 1h50min (single exp of 10 min)
CCD Canon EOS 5D with baader filter
Location Colle del Nivolet (AO, Italian Alps) at 2530 m height
18-19 Jul 2010
Mount Gemini G-41
Tracking ST4 on a 80mm f/5 refractor
Temperature and humidity T=+6 to +2°C, RH=50 to 100%
Sky brightness at zenith (with SQM-L) 20.6 to 21.6 mag/arcsec^2
Notes First part of the night with the first quarter Moon in the sky! Diffraction spikes with StarSpikes software.

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