Looking to find more information regarding these two camera lenses? Check out our side by side comparison of the Sigma 20mm F1.8 EX DG Aspherical RF vs Sony 20mm F2.8to review specs, pros and cons, and which is right for you.
Sigma 20mm F1.8 EX DG RF Top Features
- 20mm Focal Range
- F1.8 Max Aperture
- Filter Thread: 82mm
- Max Format: 35mm FF
- Sony Alpha Mount
- Weight: 520g.
- Diameter: 89mm
- Length: 90mm
- Min Focus Distance:0.2m
Sony 20mm F2.8 Top Features
- 20mm Focal Range
- F2.8 Max Aperture
- Filter Thread: 72mm
- Max Format:
- Sony Alpha Mount
- Weight: 285g.
- Diameter: 78mm
- Length: 54mm
- Min Focus Distance:0.25m
- Max Magnification:0.13x
Our Winner: Sigma 20mm F1.8 EX DG Aspherical RF over Sony 20mm F2.8
Max Aperture – Wide
1.8
vs
2.8
Wider aperture at wide end
Max Aperture – Tele
1.8
vs
2.8
Wider aperture at tele end
Diaphgragm Blades
9
vs
7
Potentially more rounded and smooth bokeh
Aperture Ring
Yes
vs
No
able to adjust the aperture on the lens
Minimum Focus Distance
0.2m
vs
0.25m
can focus closer to the subject
Weight
285g
vs
520g
235g lighter
Diameter
78mm
vs
89mm
11mm smaller in diameter
Length
54mm
vs
90mm
36mm shorter
Filter Thread
72mm
vs
82mm
Smaller filters are cheaper and easier to find
Max Magnification
0.13x
vs
x
higher magnification better for close-up shots
Image Stabilization
No
vs
No
Reliant on in-body Image Stabilization
Weather Sealing
No
vs
No
not safe under rain and dust
Sigma 20mm F1.8 EX DG RF vs Sony 20mm F2.8 All Features
General
Sigma 20mm F1.8 EX DG RF
Sony 20mm F2.8
Brand
Sigma
Sony
Lens Type
Prime
Prime
Price
CHECK PRICE
CHECK PRICE
Lens Type
Wideangle Prime
Wideangle Prime
Lens Mount
Sony Alpha
Sony Alpha
Max Format
35mm FF
35mm FF
Focal Range
20mm
20mm
Image Stabilization
No
No
Colour
Black
Black
Zoom Method
No Zoom
No Zoom
Power Zoom
No
No
Zoom Lock
No
No
Zoom Ratio
1.0X
1.0X
Aperture
Max Aperture
F1.8
F2.8
Min Aperture
F22.0
F22.0
Aperture Ring
Yes
No
Diaphragm Blades
9
7
Optics
Optical Elements
13
10
Optical Groups
11
9
Special Elements
2 aspherical elements
unknown
Focusing
Min Focus Distance
0.2m
0.25m
Max Magnification
unknown
0.13X
Autofocus
Yes
Yes
AF Motor Type
unknown
Screw drive from camera
Full Time Manual
Yes
Focus Method
Rear
Rear
Distance Scale
Yes
Yes
DoF Scale
Yes
Yes
Distance Scale
Yes
Yes
Focus Distance Limiter
Unknown
Unknown
Physical Specs
Weight
520g
285g
Diameter
89mm
78mm
Length
90mm
54mm
Materials
Unknown
Unknown
Weather Sealing
Unknown
Unknown
Filter Thread
82mm
72mm
Filter Notes
–
–
Hood Supplied
Yes
Yes
Hood Code
petal type hood
petal hood SH0013
Tripod Collar
No
No
Optional Accessories
–
–
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