Sigma Mirror 600mm f/8 Telephoto
Sigma Mirror 600mm f/8 Telephoto is a manual focus super telephoto lens for full frame cameras.
122 mm long, requires consideration if you want to carry in the camera bag. Weights 830 grams so it is a heavy lens, consider using its own lens bag. 95 mm lens filter diameter, finding lens in this range can be expensieve consider using Cokin system if you really need one.