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.”

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