Compare Sigma 70mm F2.8 DG Macro vs Sigma 20mm F1.4 DG HSM vs Sony 20mm F1.8 G
Construction
Aperture Blades
9 blades
9 blades, Rounded blades
Colors
Black
Black
Form Factor
Short Telephoto Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
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
Canon EF-mount, Nikon F-mount, Sigma SA-mount, Sony E-mount, Leica L-mount
Sony E-mount
Motor
Micromotor
Ring-type ultrasonic
Linear Motor
Optical Formula | Elements
13 elements
15 elements
14 elements
Optical Formula | Groups
10 groups
11 groups
12 groups
Optical Formula | Special Glass
Two FLD glass elementsTwo SLD glass elementsTwo aspherical elements groups
Two FLD, five SLD elements + Super Multi-Layer coating groups
2 aspherical + 3 ED elements, Nano AR coating groups
Dimensions
Filter Diameter
49 mm / 1.93 in
67 mm / 2.64 in
Size | Diameter
71 mm / 2.80 in
91 mm / 3.58 in
74 mm / 2.91 in
Size | Length
106 mm / 4.17 in
130 mm / 5.12 in
85 mm / 3.35 in
Weight
515 g / 18.20 oz
950 g / 33.57 oz
373 g / 13.18 oz
Function
Angle Of View
34.4° Diagonal | 28.8° Horizontal | 19.5° Vertical
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
Aperture
f/2.8 ~ f/22
f/1.4 ~ f/16
f/1.8 ~ f/16
Autofocus
Yes
Yes
Yes
Focal Length
70 mm
20 mm
20 mm
Focus Type
Extending front
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
No
Yes
Performance
Max Magnification
1x
0.14x
0.22x
Min Focus Distance
260 mm / 10.24 in
300 mm / 11.81 in
190 mm / 7.48 in
Production
Accessory
Lens Hood: LH708-01 (supplied)
Lens hood included
Lens hood included
Debut
2018-02-27
2015-10-16
2020-02-25
Made In
Japan
Japan
Model Name
SEL20F18G
Reviews
Neofiliac score
91%
55%
88%
Pros
- 1x maximum magnification
- Weather-sealed
- Rather lightweight for a 1:1 macro lens
- High level of resolution
- Bright maximum aperture
- Weather-sealed
- Declickable aperture ring
- Very sharp corner to corner
- Low distortion
Cons
- External focusing
- Built between Art and Contemporary line
- 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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