Sigma 28-84 F3.5-4.5 Zoom Theta III
(AKA Synchro-II)
Announced October 1984


Sigma 28-84mm F3.5-4.5 Zoom Theta III

Construction 14 Elemts in 11 Groups
Focal Length 28-84mm
Maximum Aperture ƒ22
Minimum Aperture ƒ3.5-4.5
Field of View 75-23°
Minimum Focus Distance 50 cm
Number of blades NA
Maximum Magnification 1:4.85
Zooming System Two Rings Rotary Type
Filter Size 58 mm
Diameter 67 mm (max.)
Length 89 mm
Weight 480g
SRP at launch: £130
Available Mounts: MF: Nikon, Canon, Minolta, Pentax, Olympus, Ricoh, Contax, Yashica.