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