Sigma 18-35mm f/1.8 Art DC HSM Zoom Lens with Flash + Soft Box & Diffuser + 3 Filters + Kit for Sony Alpha A-Mount DSLR Cameras Type: Wide Angle Lens Focal Length: 18 - 35 mm Camera Mount: Sony Aperture: Maximum: f/1.8 Minimum: f/22 Compatibility: Sony Diameter: 72 mm Focus Type: Auto Focus Filter thread (Diameter): 72 mm