Nikon Nikkor Ai 28mm f2

A direct Ai upgrade from the previous K model.

VersionSerial noDateScrewsEngravingNotes
Ai450001 < 450017 453940 >1977 - 5+LMIJThick rear protector, long projection from max aperture post prevents it fitting TC-16.
Ai< 453953 454838 > - 5+MIJThin rear protector, long projection from max aperture post.
Ai540021 < 540039 545201 > - 5+MIJNew serial number from TC-16 manual. Short extension from the max aperture post, otherwise identical to earlier types.
Ai< 543786 565127 > - Nov813+MIJNow with three screws in lens mount.

Ai 28/2 type 1