Samyang 500mm f/8.0 Telephoto Lens & 2x Teleconverter with 67 Monopod + Accessory Kit for Sony Alpha Digital SLR Cameras Type: Fixed Length Lens Focal Length: 500 mm Compatibility: Sony Diameter: 67 mm Filter thread (Diameter): 67 mm Specifications: Versatile enough for use with wildlife, sports, nature and surveillance photography Weight: 3.29 Parts: 1 year