Samyang 20mm f/1.8 ED AS UMC vs Pentax smc Pentax-A 20mm f/2.8
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 need 1⅓ stops more light for low light or background blur (f/1.8 vs f/2.8)
- You shoot close-ups: it focuses down to 0.2 m vs 0.25 m
Pick the Pentax smc Pentax-A 20mm f/2.8 if
Our spec data shows no clear advantage for this lens.
Spec differences
8 differences| Samyang 20mm f/1.8 ED AS UMC | Pentax smc Pentax-A 20mm f/2.8 | |
|---|---|---|
| Brand |
Samyang
|
Pentax
|
| Max aperture |
f/1.8
1⅓ stops faster
|
f/2.8
|
| Weight |
493 g
|
not listed
|
| Length |
86.9 mm
|
not listed
|
| Diameter |
83 mm
|
not listed
|
| Filter thread |
77 mm
|
67 mm
|
| Min focus distance |
0.2 m
closer
|
0.25 m
|
| Optical design |
13 elements / 12 groups
|
10 elements / 9 groups
|
6 identical specs hidden: mount, type, format, focal length, autofocus motor, image stabilization. Show all
- Mount
- Pentax K both
- Type
- Prime both
- Format
- Full frame both
- Focal length
- 20mm both
- Autofocus motor
- Manual focus 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
Pentax smc Pentax-A 20mm f/2.8
The Pentax smc Pentax-A 20mm f/2.8 is a wide-angle prime lens covering 20mm at f/2.8 for Pentax K mount cameras. The wide view suits landscapes, architecture and environmental shots.
More comparisons
Samyang 20mm f/1.8 ED AS UMC vs Sigma 20mm f/1.8 EX DG ASPHERICAL RF
Voigtlander Color Skopar 20mm F3.5 SLII Aspherical vs Pentax smc Pentax-A 20mm f/2.8
Pentax smc Pentax-A 20mm f/2.8: ⅔ stop faster
Samyang 20mm f/1.8 ED AS UMC vs Sigma 20mm f/1.4 DG HSM Art
457 g lighter vs ⅔ stop faster
Pentax smc Pentax-A 20mm f/2.8 vs Samyang 20mm T1.9 ED AS UMC
Samyang 20mm T1.9 ED AS UMC: 1 stop faster, focuses closer
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-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