|DC||The lens is designed only for APS-C digital cameras.|
|HSM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
|| A||Belongs to Art series lenses.|
|Diagonal angle of view:||30.4°-15.5° (Canon APS-C)
|31.6°-16.1° (Nikon APS-C)
|27.9°-14.2° (Sigma APS-C)
|Lens construction:||21 elements in 15 groups, including:|
|Number of blades:||9|
|Closest focusing distance:||95 cm|
|Type of autofocus motor:||Hyper Sonic Motor (Canon EF)|
|Hyper Sonic Motor (Nikon F)|
|Hyper Sonic Motor (Sigma SA)|
|Full-Time Manual Focus:||Yes|
|Weight:||SA: 1490 g|
|Maximum diameter x Length:||SA: Ø93.5 x 170.7 mm|
|Materials:||High-quality plastic barrel (TSC)|
|Filter size:||82 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 large, heavy, 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 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 82 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).
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 or Sigma SA. Teleconverters, USB docks and other accessories for this lens are not eligible for MCS.
The lens does not feature optical image stabilizer. It is a significant disadvantage for a lens of such class - the need for image stabilization only grows with increasing of focal length. In order to obtain sharp images with this lens, you will need to use a tripod or shutter speeds not longer than 1/100 second (at focal length of 100 mm) which may require in some cases increasing the ISO setting and will lead to noisy images.
|Camera:||Canon EOS 50D|
|Sensor size:||22.3×14.9 mm|
|Distortion at 50 mm:||-0.17 %|
|Distortion at 100 mm:||+1.35 %|
|Vignetting at 50 mm F/1.8:||-1 EV|
|Vignetting at 100 mm F/1.8:||-1.17 EV|