Higher numbers give you a narrower field of view and more magnification; for example, a 400mm lens is a telephoto ... consider spending more on the Canon EF 100mm f/2.8L IS USM (160mm equivalent ...

Our guide to the best Canon RF mount lenses, by Joshua Waller, is here to help you find the perfect glass for your EOS R ...

In summary, the Canon EF 400mm f/2.8L IS III USM lens is a superb performer. You can view additional images in the Equipment Database, where you can add your own review, photos and product ratings.