Scorpius and Zeta Oph nebula (Sh2-27)

Technical Data
Optics Canon 50mm f/1.8 MkII
Focal Lenght 50 mm
Focal Ratio f/4
Exposure Time 48 min (single exp of 4 min)
CCD Canon EOS 5D with baader filter
Location Pian dell'Armà (PV, Italian Appennines) at 1350m height
4 july 2008
Mount Gemini G-41
Tracking no corrections
Temperature and humidity T=+14°C, RH=55%
Sky brightness at zenith (with SQM-L)
21.3 mag/arcsec^2
Notes -

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