The Focal Length Calculator is used to determine the lens size required to see a certain size object from a distance.

Using the Calculator

  1. Select the Image Sensor Size (CCD)
  2. Enter the Distance to the object
  3. Enter the Width/Height of the object you want to monitor.
  4. Click "Calculate" - A summary will be displayed to explain the results
CCD Size

IMPORTANT: These calculators are to be used as a guide ONLY and not relied on for critical monitoring applications.