Nikon Nikkor Ai 20mm f4

A direct Ai upgrade from the previous K model. Some have serial numbers belonging to the K series. These are not AI conversions, and were probably factory made using up older parts.

VersionSerial noDateScrewsEngravingNotes
Ai130001 < 130087 140763 >1977 - Jan785+LMIJ-


  • Article at Photography in Malaysia site
  • Review by Fredrik Rasmussen
  • Review by Ken Rockwell
  • Development of Nikkor 20mm f4 at Nikon site