The distance from the second principal point to the focal point. At Optikos, our LensCheck™ LWIR, LensCheck™ Vis, and the OPTEST™ MTF Testing System measure effective focal length among other things.
The Optical Engineering Experts
The Optical Engineering Experts
The distance from the second principal point to the focal point. At Optikos, our LensCheck™ LWIR, LensCheck™ Vis, and the OPTEST™ MTF Testing System measure effective focal length among other things.