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Instructions:
Select the lens format you are using.
Enter any 2 of the 3 other pieces of information.
Press the "Calculate" button to get the missing piece of information. (Press the "Reset" button to clear the form and start over.)
Select lens format: 1/4 inch 1/3 inch 1/2 inch 2/3 inch 1 inch
Enter distance to object (in feet):
Enter width of picture (in feet): or Enter height of picture (in feet):
Enter size of lens (in millimeters):
