Samyang 500mm f/8.0 Telephoto Lens & 2x Teleconverter with 58 Tripod + Accessory Kit for Nikon Digital SLR Cameras Type: Fixed Length Lens Focal Length: 500 mm Compatibility: Nikon Diameter: 67 mm Filter thread (Diameter): 67 mm Specifications: Versatile enough for use with wildlife, sports, nature and surveillance photography Weight: 4.85 Parts: 1 year