Focal Length Maximum
Focal Length Maximum. Zoom lenses have variable Focal Length. This indicates their Maximum.
Zoom lenses zoom through a range of focal lengths. The Focal Length Maximum is used to recored the maximum focal lenght that a particular lens can acheive.
In the case of a zoom lens it will ge greater than its mimimum. In a standard (non-zoom) lens we give the maximum and minimum focal length the same value.