Canon EF 600mm f/4 L IS USM

The Canon EF 600mm f/4L IS USM is a professional super-telephoto lens beloved by wildlife and sports photographers for its exceptional reach and optical quality. Unlike its RF counterpart, this EF version requires Canon's EF-RF adapter when used with mirrorless bodies, adding bulk and weight. The newer RF 600mm f/4L IS USM offers improved image stabilization (5.5 stops vs 2), faster AF communication, reduced weight, and enhanced optical formula, though at a significantly higher price point than the still-impressive EF version.