Sigma 24-70mm F2.8 EX Aspherical DF
Launched February 2001
The SIGMA 24-70mm F2_S EX ASPHERICAL DF is one of several new products to be introduced at PMA 2001 by Sigma Corporation of Japan (2-3-15, Iwado-Minami, Komae-shi, Tokyo).
This lens covers focal lengths from 24mm ultra wide angle to 70mm medium telephoto and provides a large F2.8 aperture at all focal lengths and unusually close focusing capability of 15.7 inches. Its design employs three (3) aspherical lens elements to minimize spherical aberration, astigmatism and sagittal comma flare.
The use of two (2) SLD (The Special Low Dispersion) glass elements results in excellent correction of chromatic aberration and provides a high level of optical performance.
Thus, the 24-70mm F2.S EX ASPHERICAL DF has high contrast and resolution. The lens also incorporates dual focus mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focusing, and yet provides a wide focus ring for easy to use manual focus. Since the front of the lens does not rotate, it allows the use of a “flower shaped bayonet hood” and facilities the use of polarizing filters.
The lens materials used in this new lens are lead and arsenic free ecological glass.
|Construction||14 Elements in 13 Groups|
|Field of View||84.1-34.3°|
|Minimum Focus Distance||40cm|
|Number of blades||9|
|SRP at launch:||NA|
|Available Mounts:||Sigma SA, Minolta, Nikon, Pentax, Canon|