The EF 400mm f/5.6L USM Canon lens is dubbed as a super telephoto lens by Canon. As the name suggests, the lens has a super build quality and it can produce superior image quality. While it is well built, the lens is still relatively light. The lens measures 3.5" x 10.1" and weighs 44.1 oz. The lens is quite long and narrow. But most importantly, the Canon EF 400mm F/5.6L USM Lens can deliver exceptional mechanical and optical performance.
Canon has equipped the lens with a Ring Ultrasonic Motor (USM) to help you achieve a fast and silent autofocus. You can also use the available Full Time Manual focusing if desired.
The lens can help produce image that has excellent color, contrast and saturation. Both Chromatic Aberration and vignetting can be kept to a minimum. Meanwhile, the 8-blade aperture can help produce wonderful background blur quality.
The Canon EF 400mm f/5.6L USM is most suitable for outdoor photography use.
For its price range, there's no denying that the lens can produce superior and exceptional image quality.