Nikon AI Nikkor series lenses

The AI line was created by Nikon in 1977. It was a new system for coupling the lens to the camera's exposure system. A cam on the lens' aperture ring, known as the Meter Coupling Ridge, indicates the maximum as well as the preset aperture directly to the camera. AI Nikkors provide automatic maximum-aperture indexing (AI) and full-aperture metering, their secondary aperture scale also provides Aperture Direct Reading (ADR). Each AI-Nikkor also incorporates a meter-coupling shoe providing full-aperture metering with all pre-AI Nikon/Nikkormat meter systems.

Diaphragms - automatic, preset, or manual - of non-AI and AI lens types function in an identical manner with all Nikon-system cameras.

The mechanics of the AI lenses were improved. In earlier lenses the double helix that moves the optical system away from the film plane when focusing at close range distances causes the focusing ring to move forwards as well. To improve handling the two helixes in the AI lenses have different thread pitches. So, whilst the optical system is moved forward, the focusing ring is only displaced by a fraction of a millimeter. The depth-of-field scale is now located on the chrome ring between the focusing and aperture rings.

For a while Nikon offered a service to convert earlier pre-AI lenses to the new AI-system standard.

35mm full frame, Manual focus, For SLR cameras (57)
Nikon AI Fisheye-Nikkor 6mm F/2.8Pro 1977 
Nikon AI Fisheye-Nikkor 8mm F/2.8Pro 1977 
Nikon AI Nikkor 13mm F/5.6Pro 1977 
Nikon AI Nikkor 15mm F/5.6Pro 1977 
Nikon AI Nikkor 15mm F/3.5Pro 1978 
Nikon AI Fisheye-Nikkor 16mm F/3.5 1977 
Nikon AI Fisheye-Nikkor 16mm F/2.8 1979 
Nikon AI Nikkor 18mm F/4 ⌀86Pro 1977 
Nikon AI Nikkor 20mm F/4 ⌀52Pro 1977 
Nikon AI Nikkor 20mm F/3.5 ⌀52Pro 1977 
Nikon AI Nikkor 24mm F/2.8 ⌀52 1977 
Nikon AI Nikkor 24mm F/2 ⌀52 1977 
Nikon AI Zoom-Nikkor 25-50mm F/4 ⌀72 1979 
Nikon AI Nikkor 28mm F/3.5 ⌀52 1977 
Nikon AI Nikkor 28mm F/2.8 ⌀52 1977 
Nikon AI Nikkor 28mm F/2 ⌀52 1977 
Nikon AI Zoom-Nikkor 28-45mm F/4.5 ⌀72 1978 
Nikon AI Nikkor 35mm F/2.8 ⌀52 1977 
Nikon AI Nikkor 35mm F/2.8 ⌀52 1979 
Nikon AI Nikkor 35mm F/2 ⌀52 1977 
Nikon AI Nikkor 35mm F/1.4 ⌀52 1977 
Nikon AI Zoom-Nikkor 35-70mm F/3.5 ⌀72 1977 
Nikon AI Zoom-Nikkor 43-86mm F/3.5 ⌀52 1977 
Nikon AI Nikkor 50mm F/2 ⌀52 1977 
Nikon AI Nikkor 50mm F/1.8 ⌀52 1978 
Nikon AI Nikkor 50mm F/1.4 ⌀52 1977 
Nikon AI Nikkor 50mm F/1.2 ⌀52 1978 
Nikon AI Zoom-Nikkor 50-300mm F/4.5 ⌀95 1977 
Nikon AI Zoom-Nikkor 50-300mm F/4.5 ED ⌀95 1977 
Nikon AI Micro-Nikkor 55mm F/3.5 ⌀521:2 1977 
Nikon AI Nikkor 55mm F/1.2 ⌀52 1977 
Nikon AI Noct-Nikkor 58mm F/1.2 ⌀52 1977 
Nikon AI Zoom-Nikkor 80-200mm F/4.5 ⌀52 1977 
Nikon AI Zoom-Nikkor 80-200mm F/4.5 ⌀52 1977 
Nikon AI Nikkor 85mm F/2 ⌀52 1977 
Nikon AI Micro-Nikkor 105mm F/4 ⌀521:2Pro 1977 
Nikon AI Nikkor 105mm F/2.5 ⌀52 1977 
Nikon AI Nikkor 135mm F/3.5 ⌀52 1977 
Nikon AI Nikkor 135mm F/2.8 ⌀52 1977 
Nikon AI Nikkor 135mm F/2 ⌀72 1977 
Nikon AI Nikkor 180mm F/2.8 ⌀72 1977 
Nikon AI Nikkor 200mm F/4 ⌀52 1977 
Nikon AI Micro-Nikkor 200mm F/4 IF ⌀521:2Pro 1978 
Nikon AI Nikkor 200mm F/2 ED-IF ⌀122 1977 
Nikon AI Nikkor 300mm F/4.5 ED ⌀72Pro
Nikon AI Nikkor 300mm F/4.5 ⌀72Pro 1977 
Nikon AI Nikkor 300mm F/4.5 IF-ED ⌀72Pro 1978 
Nikon AI Nikkor 300mm F/2.8 ED-IF ⌀122Pro 1977 
Nikon AI Nikkor 400mm F/5.6 ED ⌀72Pro 1977 
Nikon AI Nikkor 400mm F/5.6 IF-ED ⌀72Pro 1978 
Nikon AI Nikkor 400mm F/3.5 IF-ED ⌀122Pro 1977 
Nikon AI Nikkor 500mm F/4P ED-IF ⌀122Pro 1988 
Nikon AI Nikkor 600mm F/5.6 IF-ED ⌀122Pro 1977 
Nikon AI Nikkor 600mm F/4 ED-IF ⌀160Pro 1977 
Nikon AI Nikkor 800mm F/8 IF-ED ⌀122Pro 1978 
Nikon AI Nikkor 1200mm F/11 IF-ED ⌀122 1979 
Nikon AI Nikkor 1200-1700mm F/5.6-8P IF-ED 1988 

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