One of Canon's top selling lenses, the EF 17-40mm f/4L USM is a magnificent combination of super high quality and impressive specifications that make it one of the best ultra-wide lenses available. The 17-40mm focal length is something special, and is ultra-wide on a full-frame DSLR that provides the user with one of the widest and most visibly appearing products on Canon's shelves. The EF 17-40mm f/4L USM utilizes Ring USM and has a rapid focus speed that blends perfectly with high accuracy and a pleasant, quiet sound. The EF 17-40mm f/4L USM is even weather-sealed, but does require a UV Filter to complete the sealing.
 Canon EF 17 40mm F 40 L USM Lens  US $590.00
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 Lens Hood Sun Shade EW 83E for Canon EF 17 40mm f 4L U US $5.34
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 CLOSE UP MACRO SET FOR CANON EF 17 40mm f 40L USM LENS US $58.58
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The Canon EF 17-40mm f/4L USM is a perfect blend of colors and contrast, never leaning too far towards any particular color scheme while maintaining a clear image throughout. While corners receive the most distortion, the EF 17-40mm f/4L USM does a good job of limiting it, especially above 24mm. While the EF 17-40mm f/4L USM is not the fastest of Canon's ultra-wide lenses, the quality will more than make up for the slower speed. This gives a higher quality still image shot that will result in much less blurriness than most standard high-speed, ultra-wide lenses.
Delivering a very respectable maximum magnification of .25x at 40mm, the Canon EF 17-40mm f/4L USM is becoming a very reliable everyday lens, and is rapidly gaining a reputation as a lens that can accompany you anywhere and be ready for action when the perfect shot arises. It is a perfect size and weight as well, topping out at 16.8 ounces makes it heavy enough for stability yet light enough for comfort and ease. The EF 17-40mm f/4L USM is one of Canon's best ultra-wide lenses and certainly carries plenty of firepower.
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