|EX||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.|
|DC||The lens is designed for APS-C digital cameras.|
|OS||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.|
Sigma lenses for Olympus, Pentax and Sony digital SLR cameras are not equipped with optical image stabilizers because these cameras have built-in sensor-shift image stabilization technology.
|HSM||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°-30.4° (Canon APS-C)
79.5°-31.6° (Nikon APS-C)
79.5°-31.6° (Pentax APS-C)
72.3°-27.9° (Sigma APS-C)
79.5°-31.6° (Sony APS-C)
|Lens construction:||17 elements in 13 groups, including 3 ASPH, 2 FLD|
|Closest focusing distance:||28 cm|
|Number of diaphragm blades:||7|
|Type of autofocus motor:||Ultrasonic (Canon EF)
Ultrasonic (Minolta/Sony A)
Ultrasonic (Nikon F)
Ultrasonic (Pentax K)
Ultrasonic (Sigma SA)
|Full-Time Manual Focus:||No|
|Image stabilizer:||Canon EF
|Stabilizer features:||Mode 1
|Stabilizer efficiency:||up to 4 stops|
|Weight:||SA: 565 g|
|Maximum diameter x Length:||SA: Ø83.5 x 91.8 mm|
|Materials:||High-quality plastic barrel, metallic mount|
|Filter size:||77 mm|
The lens barrel is of moderate weight, made of high-quality plastic. The lens mount is metallic.
The lens features a zoom lock lever to keep the zoom ring fixed at the shortest focal length of 17 mm. This function is convenient for carrying a camera with the lens on a strap because it prevents the lens from extending.
The lens features AF/M focus mode switch.
|AF||Autofocus mode without Full-Time Manual Focus.|
|M||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.
Versions of the lens for Canon EF, Nikon F and Sigma SA mounts feature optical image stabilizer, which, according to the manufacturer, compensates up to 4 stops of shutter speed. Theoretically it allows to capture sharp images of static subjects at shutter speeds down to 1/3 second at focal length of 50 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.
The focusing ring rotates during autofocus which looks pretty anachronistic by today's standards. It is strongly recommended not to touch the ring or manually stop its movement because it might result in damage to the lens and/or camera.
|Camera||Nikon D7000||Canon EOS 50D||Canon EOS 50D|
|Sensor size||23.6×15.6 mm||22.3×14.9 mm||22.3×14.9 mm|
|Distortion at 17 mm||-3 %||-2.91 %||-3.47 %|
|Distortion at 50 mm||+0.7 %||+0.71 %||+0.66 %|
|Vignetting at 17 mm F/2.8||-1.41 EV||-1.3 EV||-1.37 EV|
|Vignetting at 50 mm F/2.8||-1.03 EV||-0.91 EV||-1.08 EV|
|Efficiency of Image Stabilizer||up to 3 stops|
|User Manual. Multilingual, Adobe PDF, 2 MB|
|Prime lenses for Canon EOS DSLR cameras|
|Pentax lenses: compendium|