|DG||The lens is designed for full-frame SLR cameras but can be also used on APS-C SLR 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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|Maximum format:||35mm full frame|
|Diagonal angle of view:||94.5° (35mm full frame)
80.8° (Canon APS-H)
68.4° (Canon APS-C)
70.5° (Nikon APS-C)
63.7° (Sigma APS-C)
|Lens construction:||15 elements in 11 groups, including 1 ASPH, 1 Bi-ASPH, 2 FLD, 5 SLD|
|Closest focusing distance:||27.6 cm|
|Number of diaphragm blades:||9|
|Type of autofocus motor:||Ultrasonic (Canon EF)
Ultrasonic (Nikon F)
Ultrasonic (Sigma SA)
|Full-Time Manual Focus:||Yes|
|Weight:||SA: 950 g|
|Maximum diameter x Length:||SA: Ø90.7 x 129.8 mm|
|Materials:||High-quality plastic barrel, metallic mount|
|Filter size:||No thread|
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.
World's first F/1.4 ultra-wide-angle lens for full-frame DSLRs.
The lens barrel is 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 focusing ring is wide, rubberized and finely-ribbed in order to provide a good grip and to prevent slippage of the fingers.
The lens features AF/MF focus mode switch.
|AF||Autofocus mode with Full-Time Manual Focus.|
|MF||Manual focus mode.|
Due to the prominent convex profile of the front element the lens does not have a filter thread.
The lens is equipped with ultrasonic motor, the autofocus is virtually silent and fast.
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 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.
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 sharpness is very good at the center of the frame already wide open and excellent from F/2.8. The edges of the frame are good wide open, very good from F/2 and excellent from F/4. The corners are mediocre wide open, good at F/2-2.8 and very good from F/4.
|Camera||Canon EOS 5Ds R||Canon EOS 5D mark III|
|Sensor size||36×24 mm||36×24 mm|
|Distortion||-2.44 %||-2.15 %|
|Vignetting at F/1.4||-3.36 EV||-3.02 EV|
|Prime lenses for Canon EOS DSLR cameras|
Alternatives (AF, 17..23 mm)
|Canon EF 20mm F/2.8 USM||1992||⊗|
|Sigma 20mm F/1.8 EX DG Aspherical RF||2000||⊗|