This tool can be used to calculate the distance, lens size (focal length), or the
height and width
of the field of view, by entering values for the other inputs. Select one of the following and
then enter the required values:

Width (ft)

Height (ft)

Distance to object (ft)

Focal length (mm)

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.