How to use the Lens Calculator:
1. To find out which lens you need, enter the target
distance of the object, and the Width and Height (in feet) of the field of view.
2. To calculate the field of view you can expect with a given lens,
enter the target distance of the object, and the lens size (focal length) in millimeters.
3. Click "Calculate". Make sure you click "Clear" before you make a new calculation.
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