|DC||The lens is designed for APS-C digital cameras.|
|HSM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
|| A||Art series lens designed with a focus on sophisticated optical performance and abundant expressive power. Delivers high-level artistic expression.|
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|Diagonal angle of view:||74.1°-42.5° (Canon APS-C)
76.3°-44° (Nikon APS-C)
76.3°-44° (Pentax APS-C)
69.2°-39.1° (Sigma APS-C)
76.3°-44° (Sony APS-C)
|Lens construction:||17 elements in 12 groups, including 4 ASPH, 4 SLD|
|Closest focusing distance:||28 cm|
|Number of diaphragm blades:||9|
|Type of autofocus motor:||Ultrasonic (Canon EF)
Ultrasonic (Minolta/Sony A)
Ultrasonic (Nikon F)
Ultrasonic (Pentax K)
Ultrasonic (Sigma SA)
|Full-Time Manual Focus:||Yes|
|Weight:||SA: 810 g|
|Maximum diameter x Length:||SA: Ø78 x 121 mm|
|Materials:||High-quality plastic barrel, metallic mount|
|Filter size:||72 mm|
World's first APS-C zoom lens with constant fast aperture 1.8.
The lens barrel is heavy, made of high-quality plastic (TSC). 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 72 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.
|Camera||Canon EOS 50D||Canon EOS 50D|
|Sensor size||22.3×14.9 mm||22.3×14.9 mm|
|Distortion at 18 mm||-2.08 %||-2.46 %|
|Distortion at 35 mm||+2.07 %||+1.1 %|
|Vignetting at 18 mm F/1.8||-1.35 EV||-1.22 EV|
|Vignetting at 35 mm F/1.8||-1.51 EV||-1.33 EV|
|Prime lenses for Canon EOS DSLR cameras|
|Pentax lenses: compendium|