|Home  ||Galleries  ||Articles  ||Reviews  ||Best Gear  ||New  ||About  ||Contact  ||Gallery Index  ||Previous  ||
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:
Please visit my Extensive Articles on Photography .
Keywords to this image = astrophoto-1 star_cluster night low-light
Image ID: Double_clstr-400-a.jpg
Obtaining Images or Prints
Last updated June 05, 2023