Compare Sigma 20mm F1.4 DG HSM vs Sony 20mm F1.8 G
Construction
Aperture Blades
9 blades, Rounded blades
Colors
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Lens Barrel
Distance scale
Physical aperture ring
Lens Mount
Canon EF-mount, Nikon F-mount, Sigma SA-mount, Sony E-mount, Leica L-mount
Sony E-mount
Motor
Ring-type ultrasonic
Linear Motor
Optical Formula | Elements
15 elements
14 elements
Optical Formula | Groups
11 groups
12 groups
Optical Formula | Special Glass
Two FLD, five SLD elements + Super Multi-Layer coating groups
2 aspherical + 3 ED elements, Nano AR coating groups
Dimensions
Filter Diameter
67 mm / 2.64 in
Size | Diameter
91 mm / 3.58 in
74 mm / 2.91 in
Size | Length
130 mm / 5.12 in
85 mm / 3.35 in
Weight
950 g / 33.57 oz
373 g / 13.18 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
Aperture
f/1.4 ~ f/16
f/1.8 ~ f/16
Autofocus
Yes
Yes
Focal Length
20 mm
20 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Weather Resistance
No
Yes
Performance
Max Magnification
0.14x
0.22x
Min Focus Distance
300 mm / 11.81 in
190 mm / 7.48 in
Production
Accessory
Lens hood included
Lens hood included
Debut
2015-10-16
2020-02-25
Made In
Japan
Model Name
SEL20F18G
Reviews
Neofiliac score
55%
88%
Pros
- High level of resolution
- Bright maximum aperture
- Weather-sealed
- Declickable aperture ring
- Very sharp corner to corner
- Low distortion
Cons
- Large and heavy
- Lacks front filter thread
- Lacks weather sealing
- Not the most solidly-built
- f/1.8 limiting for night photography
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