|EF||Autofocus lens designed both for Canon full frame and APS-C SLR cameras.|
|L||Professional lens with high quality optics and robust build. Meets the highest standards and provides excellent performance and flawless image quality unachievable with traditional optical technologies.|
|USM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
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|Maximum format:||35mm full frame|
|Diagonal angle of view:||103.7°-56.8° (35mm full frame)|
|90.1°-46.1° (Canon APS-H)|
|77.3°-37.6° (Canon APS-C)|
|Lens construction:||12 elements in 9 groups, including:|
|1 Super UD|
|Number of blades:||7|
|Closest focusing distance:||28 cm|
|Type of autofocus motor:||Ultrasonic (Canon EF)|
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø84 x 97 mm|
|Weather sealing:||Dust-proof and water-resistant barrel|
|Filter size:||77 mm|
Design and Features
Canon EF 17-40mm F/4L USM is one of the popular Canon L series lenses thanks to its moderate price and useful range of focal lengths.
The lens is a part of Canon’s series of Luxury lenses notable for their excellent build quality and robust design. The lens barrel is of moderate weight, dust-proof and water-resistant, made of metal. The lens mount is metallic.
The lens has rather narrow focal range. Formally it is the disadvantage, however in practice it contributes to a good compensation of optical aberrations and equally high image quality at the entire focal range.
The lens features AF/MF focus mode switch.
|AF||Autofocus mode with Full-Time Manual Focus.|
|MF||Manual focus mode.|
The lens uses front filters with standard size of 77 mm which are easy to find. However, filters of such size are more expensive and mainly used with professional lenses.
The filter thread does not rotate during focusing which allows convenient use of different types of filters (including but not limited to polarizing and gradient).
|Camera:||Canon EOS 5D mark II|
|Sensor size:||36×24 mm|
|Distortion at 17 mm:||-3.6 %|
|Distortion at 40 mm:||+0.55 %|
|Vignetting at 17 mm F/4.0:||-2.26 EV|
|Vignetting at 40 mm F/4.0:||-1.07 EV|
|User Manual. English, Adobe PDF, 236 KB|
|User Manual. Русский, Adobe PDF, 235 KB|
|Prime lenses for Canon EOS DSLR cameras|