Sigma 70-210mm Zoom IA (Intelligent Auto)
Launched September 1992
Sigma IA Zoom 70-210m F4-5.6 is most popular range of 3x telezoom with Intelligent Auto zoom.
Sigma Intelligent Auto zoom is most sophisticated power zoom lens generally, power zoom lens is much difficult to control the zooming and almost impossible to make exact zooming stop at desired image size. However, Sigma inteligent auto zoom is easy to control zooming like manual zoom lens and has a full make of automatic zoom function, such as image fixing wide viewfinder multi-exposure during zooming.
Sigma intelligent zoom can change the zooming speed by travelling chestance as well as moving speed of the operation of the lens barrel. Also, Sigma Intelligent Zoom can make smooth and natural change of the zooming speed from start to highest speed and highest speed to stop by incorporating fuzzy logic control of the computer in the lens barrel.
| Specifications | |
| Focal Length | 28-70mm |
| Maximum Aperture | ƒ3.5-4.5 |
| Minimum Aperture | ƒ22-27 |
| Lens Construction | 11 elements in 8 groups |
| Field of View | 75-34° (Diagonal)
65.5-28.8° (Horizontal) 46.4-19.5° (Vertical) |
| Minimum Focus Distance | 0.5m |
| Number of blades | 6 |
| Maximum Magnification | 1:6.5 |
| Zooming System | Auto Zoom
Manual Zoom by rotation |
| Filter Size | 52mm |
| Diameter | 79mm (max.) |
| Length | 86.5mm |
| Weight | 350g |
| SRP at launch: | TBA |
| Available Mounts: | Minolta 3xi, 5xi, 7xi, 9xi |