Pentax smc Pentax-A 20mm f/2.8 vs Vivitar 20mm f/3.8 Wide Angle
Both are Pentax K prime lenses. Here is what actually differs.
Pick the Pentax smc Pentax-A 20mm f/2.8 if
- You need 1 stop more light for low light or background blur (f/2.8 vs f/3.8)
Pick the Vivitar 20mm f/3.8 Wide Angle if
Our spec data shows no clear advantage for this lens.
Spec differences
8 differences| Pentax smc Pentax-A 20mm f/2.8 | Vivitar 20mm f/3.8 Wide Angle | |
|---|---|---|
| Brand |
Pentax
|
Vivitar
|
| Format |
Full frame
|
not listed
|
| Max aperture |
f/2.8
1 stop faster
|
f/3.8
|
| Filter thread |
67 mm
|
not listed
|
| Min focus distance |
0.25 m
|
not listed
|
| Optical design |
10 elements / 9 groups
|
not listed
|
| Autofocus motor |
Manual focus
|
not listed
|
| Image stabilization |
No
|
not listed
|
3 identical specs hidden: mount, type, focal length. Show all
- Mount
- Pentax K both
- Type
- Prime both
- Focal length
- 20mm both
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.
Our notes
Vivitar 20mm f/3.8 Wide Angle
The Vivitar 20mm f/3.8 Wide Angle is a wide-angle prime lens covering 20mm at f/3.8 for Pentax K mount cameras. The wide view suits landscapes, architecture and environmental shots.
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Samyang 20mm f/1.8 ED AS UMC: 1⅓ stops faster, focuses closer