Sigma 28-70 Zoom Epsilon
Launched 1986
February 10th 1986 saw the 28-70 evolve further with the Zoom Epsilon ƒ3.5-4.5, a late manual focus release.
With such a straightforward lens, a straightforward PR was sufficient:
“SIGMA ZOOM EPSILON 28-70mm F3.5-4.5
This Wide to Medium telephoto zoom lens has a world smallest and popular filter size.”
| Specifications | |
| Focal Length | 28-70mm |
| Maximum Aperture | ƒ3.5-4.5 |
| Minimum Aperture | ƒ22-32 (at 70mm) |
| Lens Construction | 9 elements in 9 groups, multicoated. |
| Field of View | 75-34° (Diagonal) |
| Minimum Focus Distance | 0.5m |
| Number of blades | TBA, but they were “programmable”, so I presume compatible with automatic cameras. |
| Maximum Magnification | 1:6.7 |
| Zooming System | Two rings rotary type. |
| Filter Size | 52mm |
| Diameter | 66mm (max.) |
| Length | 72.5mm |
| Weight | 380g |
| Lens Hood | Screw-in |
| Direction of helicoid and aperture | Synchronised |
| SRP at launch: | TBA |
| Available Mounts: | TBA |