We’re pleased to present a short video tour of the Canon EF 17-40mm lens. There’s no need to download any new software – just press the play button in the middle of the screen below and wait for the video to start; you may need to press the button twice. The quality and any delay before playing may vary depending on your internet connection.

Good points Extreme wide angle coverage Well-corrected at wider focal lengths Fast and quiet USM focusing motor An exotic but affordable ‘L’ lens Bad points Zoom range too limited for general purpose Soft corners at 40mm focused at infinity Unimpressive macro capabilities Light fall-off at wide angle (but expected) Scores (relative to other zooms)   Build quality: Optical quality: Specification: Value: Overall: 22 / 25 22 / 25 19 / 25 20 / 25 83%