The Sigma Super Wide 21-35mm F/3.5-4 Macro Zoom
Before Sigma introduced this truly ultra-wide angle zoom, the widest range for wide angle zoom lenses was 24mm. The Sigma 21-35 was the world's first, and only, super wide angle zoom lens. It. Covers all four of the most important focal lengths - 21mm, 24mm, 28mm and 35mm - in one lens. And with the 21mm to 24mm focal lengths, you can create exciting changes in perspective that were not possible before. Incorporating Sigma's unique floating element system, all types of aberrations are virtually eliminated throughout the entire zoom range.
Angle of view: 92 to 63 degrees
Optical construction: 11 elements in 7 groups
Diaphragm operation: Automatic
Minimum focusing: 50cm
Weight: 465 grams