EYEPIECE  FIELD  OF  VIEW 
Actual Field of View = Eyepiece Apparent Field of View
Divided by Telescope Focal Length
Divided by Eyepiece Focal Length

  BINOCULAR  FIELD  OF  VIEW 
X ft / 1,000 yds  [Feet at 1,000 Yards]  Divide X by 52.4
Metric - X Meters at 1,000 Meters - Divide X by 16

Tom  Whitney    256-6234       E-Mail