Lens View Angle
  (Horiz) in Degrees    =


   2  x  ArcTangent  x  (Target Width in mm)
                               ____________________
                                  2 x Focal Length in mm


  Sources:  American Cinematogtapher's Manual,  Seventh Edition,  Page 163, and 196.   Also: Edmund Scientific.

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Light Chart Formula--   Site Page 26