Canon 17-40mm f/4.0L EF USM (8806a007)
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Canon 17-40mm f/4.0L EF USM | |||||||||||||||||||||||||||||||||||||||
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. Wide-angle lens for Canon systems with EF mounts and full frame sensors. It has a constant f / 4 aperture over the entire range of focal lengths, which is 17-40 mm. Autofocus is carried out by an ultrasonic motor. Aperture — 7-blade, with a minimum value of 22.
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The EF 17-40mm f/4 L USM is a high quality ultra wide angle zoom lens. The model has a wider zoom range and a constant maximum aperture of f/4, and its autofocus speed is on par with the best lens in its class, the EF 16-35mm f/2.8L USM.
The 17-40mm zoom range provides versatility and greater creative freedom for film camera users. This range of focal lengths will also be of great benefit to digital camera users. When used with an APS-C size image sensor on a Canon EOS 10D or EOS D60, it is equivalent to the 28-70mm range on a 135 standard format camera.
Minimum glare, maximum focus
To ensure a distortion-free image, the EF 17-40mm f/4 L USM lens uses three aspherical elements of two different types, and ED glass prevents chromatic aberration, which reduces the sharpness of the edges of images. In addition, the lens coating reduces ghosting and glare caused by internal reflections. By increasing the power of the focus control group, the minimum focus distance at all focal lengths is 0.28m.
Canon's Electromagnetic Diaphragm provides a more natural look to an out-of-focus image with a circular aperture that smoothes out tonal transitions. And the extra aperture reduces the chance of flare and improves overall image contrast.
