Sigma 28-85mm F3.5-4.5 Zoom Theta II
AKA “Syncro II”
Announced October 1982

Construction 15 Elements in 10 Groups

Sigma Multi Layer

Focal Length 28-85mm
Maximum Aperture ƒ22-ƒ32
Minimum Aperture ƒ3.5-4.5
Field of View 75-29°
Minimum Focus Distance 1m
Number of blades NA
Maximum Magnification 1:5.5
Zooming System Two Rings Rotary Type

Trio Cam (5 groups) drive

Filter Size 67mm
Diameter 70mm (max.)
Length 81mm
Weight 524g
SRP at launch: NA
Available Mounts: Most MF mounts.