Theoretically, long lenses should let you capture faces and license plates very far away.
For example, over 900 feet away from a 1080p camera one should get over 40ppf from a 100mm lens.
But how well does this work in practice?
In this test, we took 3 long lens cameras, including:
- An Axis 1080p PTZ
- A Dahua 720p PTZ
- A Fujinon 8-80mm varifocal lens [link no longer available] with a 720p Samsung SNB-5004 camera
We ran tests from 100 to 500 feet away from the cameras, comparing the theoretical PPF to the actual achieved.