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The Canon EF 17-40mm f/4L USM is a high-quality EF Mount L-Series Lens for full-frame and APS-C size DSLR cameras. 

Brand: Canon
Product Code: 8806A007AA
R 12,095.00
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More zoom, less aberration

The Canon EF 17-40mm f/4L USM Lens is a high-quality wide-angle zoom lensZOOM LENSAllows a camera to, unlike a fixed-focal length or prime lens, change smoothly from a long shot to a close-up or vice versa by varying the focal length. A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. Due to more moving parts, zoom lenses often produce images of slightly lesser quality than their prime lens counterparts. However due to the inherent flexibility of being able to vary the focal length, they are extremely popular for photography where composition needs to be adapted quickly - such as at weddings, for example. for full frame and APS-C size DSLR cameras. This lens combines one high-precision molded glass aspherical element and two replica aspherical lenses to achieve the extended zoom range, while also correcting for common aberrations that arise during zooming.


Smooth operator with fast, silent autofocus

The lens focuses as close as 11 inches (0.28m), while offering both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. 


Achieve a natural-looking background blur

It also has a constant f/4 maximum apertureAPERTUREAperture, shutter speed and ISO form what is known as the exposure triangle in photography. Aperture refers to an opening inside the lens, similar to the iris of your eye, that changes in diameter to control the amount of light that enters a camera. Aperture is expressed in f-stops: the lower the number, the larger the aperture, e.g. f/1.4 is larger than f/8. A larger (or wider) aperture allows more light to pass through the lens to the sensor (film) as a picture is taken, particularly useful in low-light conditions. A larger aperture also produces a shallower depth-of-field, and thus more background blur., and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. It features circular aperture diaphragm for better, more natural looking background blurring.


Features

  • EF Mount L-Series Lens
  • Aperture Range: f/4-22
  • Three Aspherical Elements, One Super UD
  • Ultrasonic Autofocus Motor
  • Manual Focus Override
  • Water and Dust Resistant
  • Internal Zooming and Focusing
  • Truly Circular Diaphragm
  • 77mm Front Filter Diameter
  • Rear Holder for Three Gel Filters

Lens

Focal Length
17-40mm
Maximum Aperture
f/4.0
Minimum Aperture
f/22.0
Barrel Type
Magnesium Alloy Barrel
Camera Mount
Canon EF, Metal Mount
Full Time Manual Focus
Yes
Minimum Focus Distance
0.28m
Internal Focus
Yes
Internal Zoom
Yes
Image Stabilization
No
Filter Thread
77mm
Weight
500g

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  • Canon EF 17-40mm f/4L USM Lens
  • E-77 II 77mm Lens Cap
  • Lens Dust Cap E (Rear)
  • EW-83E Lens Hood
  • Lens Case LP1319

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