Nikon's AI-era 200mm telephoto — the classic Nikkor f/4 with solid optics and compact design.
The Nikon Nikkor 200mm f/4 Ai is a manual-focus telephoto prime from Nikon's Ai (Automatic Maximum Aperture Indexing) era, produced primarily in the 1970s and 1980s. The Ai coupling system allows correct metering on Nikon bodies from the Ai period through to modern digital bodies that support non-CPU lens operation.
The lens delivers 200mm at f/4 maximum aperture in a fully manual configuration, with Nikon's Ai mechanical coupling for compatible metered operation, standard Nikon F-mount, and full-frame coverage. Build quality reflects the all-metal construction typical of Nikon's manual-focus professional era.
The 200mm f/4 offers a practical balance between reach and size — more compact than faster f/2.8 telephoto primes while providing useful telephoto compression for portraits, sports, and nature from distance. On modern Nikon digital bodies, manual focus operation with the Ai metering channel allows full exposure automation through aperture-priority and program modes.
Check the manual focus ring for smooth, precise operation from minimum focus distance to infinity. Inspect aperture blades carefully for oil contamination, which is common in Ai-era lenses and will cause sluggish blade operation. Verify the Ai coupling ridge is undamaged, as its condition is necessary for correct metering on compatible bodies.