Sigma 20mm f/1.4 DG HSM Art vs f/1.8 EX DG ASPHERICAL RF
Both are Pentax K prime lenses for full frame. Here is what actually differs.
Pick the 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)
Pick the f/1.8 EX DG ASPHERICAL RF if
- You shoot close-ups: it focuses down to 0.2 m vs 0.28 m
- You want bigger close-ups: 0.25× vs 0.14× maximum magnification
Spec differences
9 differences| f/1.4 DG HSM Art | f/1.8 EX DG ASPHERICAL RF | |
|---|---|---|
| Max aperture |
f/1.4
⅔ stop faster
|
f/1.8
|
| Weight |
950 g
|
not listed
|
| Length |
129.8 mm
|
not listed
|
| Diameter |
90.7 mm
|
not listed
|
| Filter thread |
not listed
|
82 mm
|
| Min focus distance |
0.28 m
|
0.2 m
closer
|
| Max magnification |
0.14×
|
0.25×
larger
|
| Optical design |
15 elements / 11 groups
|
13 elements / 11 groups
|
| Autofocus motor |
HSM
|
not listed
|
7 identical specs hidden: brand, mount, type, format, focal length, aperture blades, image stabilization. Show all
- Brand
- Sigma both
- Mount
- Pentax K both
- Type
- Prime both
- Format
- Full frame both
- Focal length
- 20mm both
- Aperture blades
- 9 both
- Image stabilization
- No both
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...
Our notes
Sigma 20mm f/1.8 EX DG ASPHERICAL RF
More comparisons
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457 g lighter vs ⅔ stop faster
Samyang 20mm f/1.8 ED AS UMC vs Sigma 20mm f/1.8 EX DG ASPHERICAL RF
Sigma 20mm f/1.4 DG HSM Art vs Samyang 20mm T1.9 ED AS UMC
1 stop faster vs focuses closer
Samyang 20mm T1.9 ED AS UMC vs Sigma 20mm f/1.8 EX DG ASPHERICAL RF
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
Pentax smc Pentax-A 20mm f/2.8 vs Sigma 20mm f/1.8 EX DG ASPHERICAL RF
Sigma 20mm f/1.8 EX DG ASPHERICAL RF: 1⅓ stops faster, focuses closer