Overview

The Nikon Nikkor 18mm f/4 Ai is a compact manual-focus ultra-wide-angle lens introduced in 1975, praised for its small size and superior performance. Optically, it matches newer 18mm lenses, with only the latest zooms offering better quality. Weaknesses are not highlighted in the excerpts. Build is solid, with AI compatibility for modern DSLRs via non-CPU menu. It suits photographers needing a classic, affordable ultra-wide for full-frame or film, though it remains expensive used.