Canon EF 11-24mm f/4 L USM is a wide-angle lens capable of taking images with an angle of view between 126° and 84°; this width guarantees full-field images with unique sharpness combined with minimal distortion. Focusing is automatic and occurs via an ultrasonic motor which is very fast and precise. The absence of stabilization could be a deterrent but it is forgotten as soon as you look at the photos taken. One of the positive aspects of this lens is that it can be used on both FF and APSC devices. The image quality is optimal in the center, while there may be some inaccuracies in the corners with cameras with a high number of megapixels. The lens hood cannot be removed and for some it could be a defect but in reality it has no negative effects on the final result of the images. The cost is very high and constitutes a deterrent for all those photographers looking for a basic kit, on the other hand this lens is one of the top of the range when it comes to wide angle lenses, a must have for a noteworthy kit. The Canon EF 11-24mm f/4 L USM is not a standard lens, it is demanding, quite heavy and not everyone is able to exploit its potential. It is not suitable for beginners or people who do not have the basics necessary for correct use, while a photographer who wishes to increase the quality of his lenses cannot help but purchase it.