The Nikkor 1000mm f/11 lens is a super-telephoto lens designed for Nikon SLR cameras, ideal for capturing extremely distant subjects such as wildlife, sports, and astronomical phenomena. With its fixed aperture of f/11, it delivers sharp and detailed images across its long focal length. The lens employs a mirror (catadioptric) design, which helps to keep its size and weight manageable despite its powerful reach. Its unique design results in distinctive donut-shaped bokeh. The lens is manual focus, allowing precise control over focus, making it a specialized tool for photographers needing exceptional magnification in a portable form factor.