Canon EF 17-40mm f/4L USM

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Canon EF 17-40mm f/4L USM

From the manufacturer

A new and affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.

url to full description on Manufacturer's web site.
From Wikipedia

The EF 17–40mm f/4L USM lens is a wide-angle lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from f/4 to f/8.

url to full article on Wikipedia.
MSRP 839 US$ Aperture (large) f/4.0
Announced 2003 Magnification 0.25x
Length 97mm Minimum focusing distance 0.27m
Weight 500gr Focal 17 –40mm
Filter diameter 77mm Diaphragm blades 7
Manufacturer Canon Color Black
Mount Type Canon EF Category Wide angle, Zoom
Published reviews
Review HA SA VI ME
KenRockwell [fontawesome icon="fa-square-o" circle="no" size="medium" iconcolor="#ed1c24" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""][fontawesome icon="fa-square-o" circle="no" size="medium" iconcolor="#ed1c24" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""][fontawesome icon="fa-square-o" circle="no" size="medium" iconcolor="#ed1c24" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""][fontawesome icon="fa-check-square-o" circle="no" size="medium" iconcolor="#6fdc64" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""]
HAnds-on, SAmple images, VIdeo, MEasurements.
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Lens features
WE CI FU ST FT CO
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WEathersealing, CIrcular aperture, FUll time manual focus, STabilization, FT:Filter threads, COnstant minimum aperture,
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2015-03-13T05:47:32+00:00