EF 75-300mm f4-5.6 III USM
This replaces the EF 75-300mm f4-5.6 II USM lens. The new lens looks similar to its predecessor, but includes a metal ring on the front part of the zoom ring to provide a touch of luxury. The main difference is that a new micro-USM (ultrasonic motor) has been used.
EOS magazine, March 1999, page 9
Focal length and maximum aperture: 75-300mm 1:4-5.6