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 Samyang 24mm f1.4 ED AS UMCto 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
- Pentax KAF Mount
- Weight: 520g.
- Diameter: 89mm
- Length: 90mm
- Min Focus Distance:0.2m
Samyang 24mm f1.4 Top Features
- 24mm Focal Range
- F1.4 Max Aperture
- Filter Thread: 77mm
- Max Format:
- Pentax KAF Mount
- Weight: 580g.
- Diameter: 83mm
- Length: mm
- Min Focus Distance:0.25m
Our Winner: Sigma 20mm F1.8 EX DG Aspherical RF over Samyang 24mm f1.4 ED AS UMC
Focal Length – Wide
20mm
vs
24mm
4mm Wider coverage
Diaphgragm Blades
9
vs
Potentially more rounded and smooth bokeh
Autofocus
Yes
vs
No
Easier, faster and more accurate focusing
Weight
520g
vs
580g
60g lighter
Minimum Focus Distance
0.2m
vs
0.25m
can focus closer to the subject
Focal Length – Tele
24mm
vs
20mm
4mm more Tele coverage
Max Aperture – Wide
1.4
vs
1.8
Wider aperture at wide end
Max Aperture – Tele
1.4
vs
1.8
Wider aperture at tele end
Diameter
83mm
vs
89mm
6mm smaller in diameter
Length
mm
vs
90mm
90mm shorter
Filter Thread
77mm
vs
82mm
Smaller filters are cheaper and easier to find
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 Samyang 24mm f1.4 All Features
General
Sigma 20mm F1.8 EX DG RF
Samyang 24mm f1.4
Brand
Sigma
Samyang
Lens Type
Prime
Prime
Price
CHECK PRICE
CHECK PRICE
Lens Type
Wideangle Prime
Wideangle Prime
Lens Mount
Pentax KAF
Pentax KAF
Max Format
35mm FF
35mm FF
Focal Range
20mm
24mm
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
F1.4
Min Aperture
F22.0
F22.0
Aperture Ring
Yes
Yes
Diaphragm Blades
9
unknown
Optics
Optical Elements
13
13
Optical Groups
11
12
Special Elements
2 aspherical elements
4 ED glass elements, 2 aspherical elements
Focusing
Min Focus Distance
0.2m
0.25m
Max Magnification
unknown
unknown
Autofocus
Yes
No
AF Motor Type
unknown
None
Full Time Manual
Yes
N/A
Focus Method
Rear
Unknown
Distance Scale
Yes
Yes
DoF Scale
Yes
Yes
Distance Scale
Yes
Yes
Focus Distance Limiter
Unknown
Unknown
Physical Specs
Weight
520g
580g
Diameter
89mm
83mm
Length
90mm
Unknown
Materials
Unknown
Unknown
Weather Sealing
Unknown
No
Filter Thread
82mm
77mm
Filter Notes
–
–
Hood Supplied
Yes
Unknown
Hood Code
petal type hood
Unknown
Tripod Collar
No
No
Optional Accessories
–
–
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