The Nikon 1000mm f/11 Reflex-Nikkor is a classic super-telephoto catadioptric (mirror) lens. By utilizing a mirror design, it packs long reach into a relatively compact and lightweight barrel compared to traditional refractive telephoto lenses.

With a fixed f/11 aperture and massive 1000mm focal length, this lens is well-suited for astrophotography, distant wildlife, and creative compression shots, producing the distinct "donut" bokeh characteristic of mirror lenses.

Note: This lens has a significant amount of visible fungus on the internal elements, which is likely to affect image quality and contrast. See Images