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Comparison of two Nikkor lenses: one an Ai version and the other an Ai-S version. The former were introduced to the market in 1977 and the latter in 1981. We used two 50mm f/1.4 lenses. Nikon's E series lenses, as well as AF and AF-D lenses, are also Ai-S lenses, and there are Pre-Ai lenses that are also Ai. CHAPTERS: 0:01 Introduction. 0:26 Similarities between the Ai and Ai-S versions of Nikon Nikkor lenses. 3:10 Differences between Nikon's Nikkor Ai and Ai-S lenses. #NikkorAi #NikkorAis