Tamron AF 70-300mm F/4-5.6 Di LD Macro Lens + Case + Accessory Kit for Sony Alpha DSLR SLT-A37, A57, A58, A65, A77, A99 Digital SLR Cameras Type: Macro Lens Focal Length: 70 - 300 mm Camera Mount: Sony Aperture: Maximum: f/4.0 - 5.6 Minimum: f/22 - 22 Compatibility: Sony Diameter: 62 mm Focus Type: Auto Focus Lens Construction: 13 elements in 9 groups