Overview

The Canon EF 600mm f/4L IS III is a super-telephoto lens praised for its superb image quality, fast AF, and excellent build. Its major improvement is a dramatic weight reduction to 6.7 lbs. Optical strengths include sharpness and compatibility with teleconverters. Weaknesses are the high cost and large size. The IS enables handheld use at slower shutter speeds. It suits professional sports and wildlife photographers needing top performance and portability.