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Message: <blockquote data-quote="Eye-level" data-source="post: 101685" data-attributes="member: 6548">All three of my non Ai lenses 28, 105, and 135 are exactly the same lens formulas used in later Ai and Ais versions.  Ai is just and indexing feature.  SOME Ais lenses are superior to their non Ai counterparts (28/2.8 is one that immediately comes to mind) but for most they are the exact same lenses just with/without indexing.Please buy Ai or Ais lenses if you need them and try not to convert non Ai unless you use Nikon conversion kits (which are becoming extremely rare nowadays)  Someday the non Ai lenses may become more valuable (at least to collectors) than the Ai or Ais because so many have been converted.</blockquote>