Canon EF 17-40mm f/4L USM is the best model for everyday use. People are unlikely to find a more productive and versatile otic system. With the versatile EF 17-40mm f/4L USM wide-angle lens, people can do wonders for photography and video. This advanced equipment is compatible with Canon L-series cameras. New model with a constant maximum aperture of f/4 is considered indispensable for portrait photography. This system with a complex optical design is no less effective for those who want to capture animals or a panorama. Such a fact is confirmed by hundreds of reviews from our customers. The high efficiency of the equipment is associated with the following technical characteristics: Manufacturer preferred 12 elements in 9 groups Angle of view is 104° to 57° 30' Seven-blade diaphragm for fast and smooth defocusing Our Take on the Canon EF 17-40mm f/4L USM Lens: Canon's designers have thought of every last detail in this new model with a solid construction. One Super UD base element is used in conjunction with 3 aspherical. With this optical system, every photographer will be able to reduce chromatic and spherical aberrations. We're talking about sports journalists and nature photographers. For sharpness, clarity and color accuracy, they are unlikely to find more efficient equipment. Weighing in at 500 g, the Canon EF 17-40mm f / 4L USM is easy to set up and quick to connect to electronics. You should definitely buy this particular model if you are looking for equipment for everyday use. Canon's engineering department will never fail experienced photographers by using only high-quality lenses. The Super Spectra coating developed by this company is considered uncontested and highly effective in eliminating glare and ghosting. This manufacturer has done everything possible so that the photographer can improve contrast in difficult lighting conditions. You will immediately understand this as soon as you take your first shot with the new Canon EF 17-40mm f/4L USM