Sigma 15-30mm f/3.5-4.5 EX DG IF Aspherical Ultra Wide Angle Zoom… CL INT15-30 F/3.5-4. 5EX DG IF Aspherical Ultra Wide Angle Zoom Lens for Nikon SLR Cameras. Ultra wide-angle zoom lens designed for Nikon digital SLR cameras. 3.5-4.5 maximum aperture. Super Multi Coating reduces flare and ghosting that tends to occur when using digital SLR cameras. 17 lens elements in 13 groups; aspherical elements at front and rear lens groups. Focal Length Description: 15-30 millimeters. Lens Type: Wide Angle. Camera Lens Description: 30 month. Maximum Focal Length: 30 Millimeters. Product Dimensions: 8.5 x 5.59 x 5.51 inches. Item Weight: 1.36 pounds. Item model number: 512-306.