|EF-S||Autofocus lens designed only for Canon APS-C digital SLR cameras.|
|IS||The lens is equipped with optical image stabilizer. The stabilizer allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without stabilizer you will have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.|
|USM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
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|Diagonal angle of view:||77.3°-27.8° (Canon APS-C)
|Lens construction:||19 elements in 12 groups, including 3 ASPH, 2 UD|
|Closest focusing distance:||35 cm|
|Number of diaphragm blades:||7|
|Type of autofocus motor:||Ultrasonic (Canon EF-S)
|Full-Time Manual Focus:||Yes|
|Stabilizer features:||Mode 1
|Stabilizer efficiency:||up to 3 stops|
|Maximum diameter x Length:||Ø84 x 111 mm|
|Materials:||Plastic barrel, metallic mount|
|Filter size:||77 mm|
The lens barrel is of moderate weight, made of plastic. The lens mount is metallic.
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).
Aspherical elements (ASPH, XA) minimize spherical aberration, astigmatism, coma and ensure excellent sharpness and contrast even at maximum aperture.
Low dispersion elements (AD, ED, LD, HLD, SD, UD etc) and fluorite elements minimize chromatic aberrations and ensure excellent sharpness and contrast even at maximum aperture.
The lens features optical image stabilizer, which, according to the manufacturer, compensates up to 3 stops of shutter speed. Theoretically it allows to capture sharp images of static subjects at shutter speeds down to 1/7 second at focal length of 55 mm(*).
* without the need to increase ISO sensitivity and/or use a tripod, at the same lighting conditions and at the same aperture
The image stabilizer does not have any specialized mode of operation and is not capable of automatic detection of panning.
|Camera||Canon EOS 50D||Canon EOS 20D|
|Sensor size||22.3×14.9 mm||22.5×15 mm|
|Distortion at 17 mm||-2.03 %||-2.47 %|
|Distortion at 55 mm||+1.15 %||+1.38 %|
|Vignetting at 17 mm F/2.8||-1.47 EV||-1.5 EV|
|Vignetting at 55 mm F/2.8||-1.11 EV||-1.2 EV|
|User Manual. English, Adobe PDF, 298 KB|
|User Manual. Русский, Adobe PDF, 304 KB|
|Prime lenses for Canon EOS DSLR cameras|