Olympus OM Zuiko Auto-W 21mm f/2 vs Tamron 28mm f/2.5 Adaptall-2
Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.
Verdict at a glance
- Olympus OM Zuiko Auto-W 21mm f/2 is faster by 0.6 stops (f/2.0 vs f/2.5), letting in more light.
- Tamron 28mm f/2.5 Adaptall-2 is lighter by 70g.
- Olympus OM Zuiko Auto-W 21mm f/2 goes wider (21mm vs 28mm).
- Tamron 28mm f/2.5 Adaptall-2 reaches further (28mm vs 21mm).
| Spec | OM Zuiko Auto-W 21mm f/2 | 28mm f/2.5 Adaptall-2 |
|---|---|---|
| Brand | Olympus | Tamron |
| Mount | Olympus OM | Olympus OM |
| Type | Prime | Prime |
| Focal length | 21mm (wider) | 28mm |
| Max aperture | f/2.0 (faster) | f/2.5 |
| Released | n/a | 1979 |
| Format | full-frame | full-frame |
| Groups | 9 | 7 |
| Af motor | none | none |
| Elements | 11 | 7 |
| Weight g | 250 | 180 (lighter) |
| Filter mm | 55 | 49 |
| Length mm | 43.5 | 37.5 |
| Diameter mm | 60.0 | 64.5 |
| Min focus m | 0.2 (closer focusing) | 0.25 |
Olympus OM Zuiko Auto-W 21mm f/2
The Olympus OM Zuiko Auto-W 21mm f/2 is a fast manual-focus wide-angle prime lens covering 21mm at f/2 for Olympus OM mount cameras. A classic compact manual-focus lens from the Olympus OM film-camera system.
Tamron 28mm f/2.5 Adaptall-2
A 28mm f/2.5 manual-focus wide-angle prime lens, the Tamron 28mm f/2.5 Adaptall-2 is designed for Olympus OM mount bodies. The wide view suits landscapes, architecture and environmental shots.