Version | Serial no | Date | Screws | Engraving | Notes |
---|---|---|---|---|---|
K,Ai | 173111 < 173275 � 177425 > 177387 | Nov74 - 1977 | 5+ | LMIJ | Name engraved on ring inside filter. Many Ai lenses in this range made using old parts. |
Ai | 190001 < 190138 � 190657 > | 1977 - | 5+ | LMIJ | New serial number block for Ai version. Early lenses with name inside filter (like K type). Thick rear lens protector. |
Ai | < 190902 � 191165 > | - | 3+ | LMIJ | Name outside filter ring, thin rear lens protector. |
Ai | < 191245 � 193859 > | - Mar82 | 3+ | MIJ | - |