Samyang 20mm f/1.8 ED AS UMC vs Sigma 20mm f/1.4 DG HSM Art
Both are Pentax K prime lenses for full frame. Here is what actually differs.
Pick the Samyang 20mm f/1.8 ED AS UMC if
- You want the lighter lens to carry: 457 g lighter (493 g vs 950 g)
- You shoot close-ups: it focuses down to 0.2 m vs 0.28 m
- You want a compact lens: 86.9 mm vs 129.8 mm long
Pick the Sigma 20mm f/1.4 DG HSM Art if
- You need ⅔ stop more light for low light or background blur (f/1.4 vs f/1.8)
- You want autofocus (HSM): the Samyang 20mm f/1.8 ED AS UMC is manual focus only
Spec differences
11 differences| Samyang 20mm f/1.8 ED AS UMC | Sigma 20mm f/1.4 DG HSM Art | |
|---|---|---|
| Brand |
Samyang
|
Sigma
|
| Max aperture |
f/1.8
|
f/1.4
⅔ stop faster
|
| Weight |
493 g
lighter
|
950 g
|
| Length |
86.9 mm
shorter
|
129.8 mm
|
| Diameter |
83 mm
slimmer
|
90.7 mm
|
| Filter thread |
77 mm
|
not listed
|
| Min focus distance |
0.2 m
closer
|
0.28 m
|
| Max magnification |
not listed
|
0.14×
|
| Aperture blades |
not listed
|
9
|
| Optical design |
13 elements / 12 groups
|
15 elements / 11 groups
|
| Autofocus motor |
Manual focus
|
HSM
|
5 identical specs hidden: mount, type, format, focal length, image stabilization. Show all
- Mount
- Pentax K both
- Type
- Prime both
- Format
- Full frame both
- Focal length
- 20mm both
- Image stabilization
- No both
Our notes
Samyang 20mm f/1.8 ED AS UMC
This 20mm f/1.8 fast wide-angle prime lens from Samyang fits Pentax K mount cameras, with extra-low dispersion glass and aspherical elements. The wide view suits landscapes, architecture and environmental shots.
Our notes
Sigma 20mm f/1.4 DG HSM Art
A 20mm f/1.4 full-frame fast wide-angle prime lens, the Sigma 20mm f/1.4 DG HSM Art is designed for Pentax K mount bodies, from the Sigma Art line with Hyper Sonic Motor autofocus. A wide-aperture wide-angle prime from Sigma's Art line, popular for astrophotography and landsca...
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1 stop faster vs focuses closer
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Samyang 20mm f/1.8 ED AS UMC: 1⅓ stops faster, focuses closer
Pentax smc Pentax-A 20mm f/2.8 vs Sigma 20mm f/1.4 DG HSM Art
Sigma 20mm f/1.4 DG HSM Art: 2 stops faster, autofocus
Samyang 20mm f/1.8 ED AS UMC vs Pentax smc Pentax-FA 20mm f/2.8
Samyang 20mm f/1.8 ED AS UMC: 1⅓ stops faster, focuses closer
Pentax smc Pentax-FA 20mm f/2.8 vs Sigma 20mm f/1.4 DG HSM Art
Sigma 20mm f/1.4 DG HSM Art: 2 stops faster