Compare Sigma 20mm F1.4 DG HSM vs Sigma 18-35mm F1.8 DC HSM vs Tokina AT-X 14-20mm F2 Pro
Construction
Aperture Blades
9 blades, Rounded blades
9 blades, Rounded diaphragm
9 blades
Colors
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Zoom Lens
Wide-Angle Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Barrel
Distance scale
Distance scale
Distance scale
Lens Mount
Canon EF-mount, Nikon F-mount, Sigma SA-mount, Sony E-mount, Leica L-mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sigma SA-mount, Sony A-mount
Canon EF-mount, Nikon F-mount
Motor
Ring-type ultrasonic
Ring-type ultrasonic
Optical Formula | Elements
15 elements
17 elements
13 elements
Optical Formula | Groups
11 groups
12 groups
11 groups
Optical Formula | Special Glass
Two FLD, five SLD elements + Super Multi-Layer coating groups
5 SLD glass elements, 4 glassmold aspherical elements groups
2 super low dispersion + multilayer film coating groups
Dimensions
Filter Diameter
72 mm / 2.83 in
82 mm / 3.23 in
Size | Diameter
91 mm / 3.58 in
78 mm / 3.07 in
89 mm / 3.50 in
Size | Length
130 mm / 5.12 in
121 mm / 4.76 in
106 mm / 4.17 in
Weight
950 g / 33.57 oz
810 g / 28.62 oz
725 g / 25.62 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (wide) ~ 44.8° Diagonal | 37.8° Horizontal | 25.8° Vertical (tele)
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical (wide) ~ 71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (tele)
Aperture
f/1.4 ~ f/16
f/1.8 ~ f/16
f/2 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
20 mm
18 mm ~ 35 mm
14 mm ~ 20 mm
Focal Length (35mm Equivalent)
27.0 mm ~ 52.5 mm
21.0 mm ~ 30.0 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
Zoom Type
Internal zoom
Internal zoom
Performance
Max Magnification
0.14x
0.23x
0.12x
Min Focus Distance
300 mm / 11.81 in
280 mm / 11.02 in
280 mm / 11.02 in
Production
Accessory
Lens hood included
Lens Hood: LH780-03 (supplied)
Lens Hood: BH-823 (supplied)
Debut
2015-10-16
2013-04-18
2015-12-28
Made In
Japan
Japan
Reviews
Neofiliac score
55%
65%
50%
Pros
- High level of resolution
- Bright maximum aperture
- Internal zoom
- High levels of resolution
- Internal zoom
- Good image quality
Cons
- Large and heavy
- Lacks front filter thread
- Lacks weather sealing
- Rather large and heavy for an APS-C lens
- Lacks weather sealing
- Very large and heavy for an APS-C lens
- Not as well built as some alternatives
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