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400 mm f/6.3 103a-F 35mm film, approximately 1 hour exposure. 4000 dpi scan.
The Exposure Factors, CEF, CEFA are measures of the relative amounts of light received from a subject. It can be used to fairly compare wildly different lens/telescope apertures and exposure times. For this image:
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Keywords to this image = astrophoto-1 galaxy Messier
Image ID: M31-400-a.jpg
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Last updated May 29, 2019