Distance to width ratio is defined as : for every foot of distance the image size would be 1 foot.
Example:
Distance width ratio of; 1: 2.2 – 4.1
1 foot wide image
Minimum distance would be 2.2 feet
Maximum distance would be 4.1 feet
This is a quick reference to determine what lens is appropriate for a specific installation. Please use the appropriate lens calculator for more detailed and accurate measurements.