Overview

The Canon EF 600mm f/4L IS II USM is praised for its dramatic weight reduction, now comparable to the older 500mm f/4, making it more handheld. Optical performance is outstanding, with sharpness and autofocus speed considered best-in-class. Build quality is superb, featuring magnesium/titanium construction, improved weather sealing, and a smooth focus ring. The lens includes a 4-stop IS with a new Mode 3 for erratic subjects. Its main drawbacks are the very high price and the large size. It suits professional wildlife and sports photographers who need the reach and portability.