Witch nebula -  IC 2118
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The name is due to the shape that resemble vaguely a profile of the face of a witch. Catalogued as IC2118, it's a very faint nebula and it reflect the blue light of the close star Rigel (Beta Orionis) that is 2.5° east.
For revealing some details of this nebula I needed to composite two images and to elaborate heavily. I tried to test two different film (E200 and Provia 400) to verify which one is the better on this nebula: both films where the same.
 
Technical Data
Optics Pentax 75 apochromatic refractor
Focal Lenght 500 mm
Focal Ratio f/6,7
Exposure Time Compositation of two images of 30 min exposure
Film Kodak E200 and Fuji Provia 400
Developement sensibility Respectively 320 ISO and 400 ISO
Location Capanne di Cosola (AL, on the Appennines, Italy) at 1500m
Date and time of exposure start 1 february 2003, 19.00 and 19.45 UT
Mount Gemini G41
Tracking ST4
Temperature and humidity T=-10°C, RH=38%
Notes -

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