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ATTAINING THE REQUIRED LENS IN MILLIMETERS
(without using a Field of View Calculator)

H = Horizontal area (in feet)
V = Vertical area (in feet)
OD = Object Distance from lens and viewing area (in feet)
F = Required Focal Length (in millimeters)

1/3" 1/2" 2/3"

F = 4.8 X OD
      H

F = 6.4 X OD
      H

F = 8.8 X OD
      H

F = 3.6 X OD
      V

F = 4.8 X OD
      V

F = 6.6 X OD
      V

H = 4.8 X OD
      F

H = 6.4 X OD
      F

H = 8.8 X OD
      F

V = 3.6 X OD
      F

V = 4.8 X OD
      F

V = 6.6 X OD
      F


            Example: Using a 1/3" camera, you want to see a 12 foot horizontal field of view
            from 25 feet away.

                                                4.8 X 25  =  120  =  10 mm lens (1/3" format) 
        12             12






Tekstar Optical, Inc.  |  75 Lackawaca Hill, Napanoch, NY 12458  | 
Phone/Fax: 845-647-5367 (LENS)  |  Cell: 516-582-3458
Email: info@tekstaroptical.com