The Nikon 135mm f/2.8 AI is a fixed telephoto lens designed for Nikon F-mount cameras, known for its optical quality and especially smooth, creamy bokeh. Built to the standards of the AI (Automatic Indexing) series, this fully manual lens provides precise control over focus and aperture, making it ideal for portraiture, stage photography, and detail work in urban or landscape settings. With a 135mm focal length, it effectively compresses perspective and isolates the subject from the background, while the wide f/2.8 aperture allows for strong low-light performance and pleasing depth of field separation. Its optical construction of 4 elements in 4 groups ensures good sharpness and natural contrast. The all-metal build gives the lens a rugged, professional feel, making it a favorite among photographers seeking a classic aesthetic and reliable performance. Compatible with all Nikon F full-frame and APS-C cameras (with 1.5x crop factor), it’s a great choice for anyone in need of a compact, bright, and high-quality telephoto prime.