Follow the instruction below

Step 1 - Select the lens format you are using.

Choose your format


Step 2 - Enter D plus either W or H.

Enter the distance to the object   Enter distance to object (in feet):   
Enter the width   Enter width of picture (in feet):     
Enter the height   Enter height of picture (in feet):   
Enter the lens   Enter size of lens (in millimeters):  
3. Press "Calculate" to get the missing information.
(Press "Reset" to clear the form.)


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