ClarkVision Photography: Night Gallery

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image Double_clstr-400-a.jpg is Copyrighted by Roger N. Clark,

The Double Cluster in Perseus, NGC 869 and NGC 884

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 star_cluster night low-light

Image ID: Double_clstr-400-a.jpg

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Last updated March 10, 2024