Introduction Being lighter, smaller and more accessibly priced than Canon’s high-speed models the firm’s f4 L-series are popular with professionals and amateurs alike. The current 17-40mm f4L USM ...
Introduction Introduced in 2003 the EF 17-40 f/4L USM was one of the first of the lightweight pro-level L-series zooms from the firm adopting a constant f4 aperture. Not only does that make the lens ...