|DC||The lens is designed only 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.|
|HSM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
|MACRO||A lens with better close-up focusing capabilities in comparison with traditional lenses. Not a macro lens though.|
|| C||Belongs to Contemporary series lenses.|
|Diagonal angle of view:||74.1°-5.2° (Canon APS-C)
|76.3°-5.4° (Sony APS-C)
|76.3°-5.4° (Nikon APS-C)
|76.3°-5.4° (Pentax APS-C)
|69.2°-4.7° (Sigma APS-C)
|Lens construction:||17 elements in 13 groups, including:|
|Number of blades:||7|
|Closest focusing distance:||39 cm|
|Magnification ratio:||1:3 @ 300 mm at the closest focusing distance|
|Type of autofocus motor:||Hyper Sonic Motor (Canon EF)|
|Hyper Sonic Motor (Minolta/Sony A)|
|Hyper Sonic Motor (Nikon F)|
|Hyper Sonic Motor (Pentax K)|
|Hyper Sonic Motor (Sigma SA)|
|Full-Time Manual Focus:||No|
|Image stabilizer:||Canon EF|
|Stabilizer features:||Mode 1|
|Stabilizer efficiency:||No information|
|Weight:||SA: 585 g|
|Maximum diameter x Length:||SA: Ø79 x 101.5 mm|
|Materials:||High-quality plastic barrel (TSC)|
|Filter size:||72 mm|
Design and Features
For information on history of Sigma and development of Sigma Global Vision line please refer to the article dedicated to Sigma 35mm F/1.4 DG HSM | A.
The lens barrel is of moderate weight, made of high-quality plastic (TSC). The lens mount is metallic. Please refer to the article dedicated to Sigma 35mm F/1.4 DG HSM | A for more information about TSC. In terms of build quality and design Sigma Global Vision line is a new direction for the company: cosmetically the lens differs from the earlier models and looks attractive.
The lens has a very wide focal range. Formally it is the advantage, however in practice it causes certain problems with compensation of optical aberrations and equally high image quality at the entire focal range.
The lens features a zoom lock lever to keep the zoom ring fixed at the shortest focal length of 18 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/MF focus mode switch.
|AF||Autofocus mode without 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.
Dedicated macro-adapter AML 72-01 provides the magnification ratio of 1:2.
The lens is compatible with Sigma USB dock, an optional accessory which allows to connect the lens to a computer and customize its operation via Sigma Optimization Pro software. The customization for this lens includes updates of firmware via the Internet, autofocus microadjustments for 4 focal lengths and 4 shooting distances and setting the amount of rotation of the focusing ring which triggers FTM focusing.
Sigma also offers paid Mount Conversion Service (MCS) for this lens. With MCS, the mount of the lens can be converted to Canon EF, Nikon F, Pentax K, Sony A or Sigma SA. Teleconverters, USB docks and other accessories for this lens are not eligible for MCS.
Versions of the lens for Canon EF, Nikon F и Sigma SA mounts feature optical image stabilizer.
The image stabilizer does not have any specialized mode of operation and is not capable of automatic detection of panning.
|Sensor size:||23.6×15.6 mm|
|Distortion at 18 mm:||-3.98 %|
|Distortion at 300 mm:||+1.1 %|
|Vignetting at 18 mm F/3.5:||-1.16 EV|
|Vignetting at 300 mm F/6.3:||-1.01 EV|
|Efficiency of Image Stabilizer:||up to 3.5 stops|