Canon EF 11-24mm f/4 USM L - APS-C Format Review / Lens Test
Lens Reviews - Canon EOS (APS-C)
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Review by Klaus Schroiff, published August 2015


Last month we reviewed the new Canon EF 11-24mm f/4 USM L on full format but it's also an interesting lens for APS-C format users as well - at least for those who are planning to upgrade to a full format camera at some stage in the future. Even for an ultra-wide zoom lens, it is extreme in its native scope and this still makes it very wide on APS-C cameras. That being said, it faces stiff competition e.g. from the Canon EF-S 10-22mm f/3.5-4.5 USM or the Sigma 8-16mm f/4.5-5.6 DC HSM - and both are very decent and available for just a fraction of the price.

The build quality of the Canon EF 11-24mm f/4 USM L is superb just as you would expect it from a Canon L lens in this price class. There's no wobbling whatsoever and the control rings operate smoothly. The lens is also designed to survive in harsh conditions with a sealing against dust and moisture. Fluorine coatings on the (immense) front and rear elements have been applied for reducing smears and fingerprints. The outer length of the lens remains constant thanks to the fixed lens hood although the inner lens tube moves a little according to the zoom setting. The front element does not rotate during focusing or zooming operations but this won't help you with filters because the (vulnerable) bulb-like front element just doesn't allow this. Conventional (front-)lens caps don't work either so the lens cap is attached to the lens hood. Honestly we would have wished for something more posh than a plastic front cap here but it does the job, of course.

The lens has a ring-type USM drive based on a front-focusing system resulting in an extremely fast AF speed. Typical for ring-type USM lenses full-time manual focusing is always possible in one-shot AF mode.

Equiv. focal length"17.6-38.4mm" (full format equivalent)
Equiv. aperture"f/6.4" (full format equivalent in terms of depth-of-field)
Optical construction16 elements in 11 groups inc 2x CaF2, 1x SUD, 1x UD and 4x aspherical elements
Number of aperture blades9 (circular)
min. focus distance0.28m @ 24mm (max. magnification ratio 1:6.5)
Filter size-
Hoodpetal-shaped, fixed
Other featuresweather sealing, Subwavelength Coating (SWC), Air Sphere Coating (ASC)