Originally Posted by chip j
AI & AIs Nikkors had aluminum barrels and, I believe, a black laquer finish rather than being anodized.
Same with the final series of pre-AI Nikkors (the K series). They also had the rubber focus ring, instead of the older scalloped metal ring.
APUG: F4, F3HP, F2AS, Nikomat FT2, Nikkormat EL, FT
Nikkors: 18-55/3.5-5.6G AF-S DX (f/D2x), 20/3.5 UD, 24/2.8 AI, 50/2 AI, 50/2 H, 50/1.4 S, 55/2.8 Micro AIS, 85/1.8 K, 105/4 Micro AIS, 180/2.8 PC
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