Nikon Nikkor 50mm f/1.2 AI-S

What mount is the Nikon Nikkor 50mm f/1.2 AI-S?

The Nikon Nikkor 50mm f/1.2 AI-S has a native Nikon F (AI-S) mount. Nikon F is the 1959 bayonet with a 46.5mm register that Nikon kept through the pre-AI, AI (1977), AI-S (1981), and autofocus eras. With a plain mechanical adapter it fits Sony E, Fuji X, MFT, Canon RF, Nikon Z, and L-mount bodies and keeps infinity focus.

• Nikon F mount lenses
• Nikon F to Sony E
• Nikon F to Fuji X
• Nikon F to MFT

How much is the Nikon Nikkor 50mm f/1.2 AI-S worth in 2026?

A used Nikon Nikkor 50mm f/1.2 AI-S typically sells for $400 to $950, with most clean working examples near $600. Basis: eBay sold listings, KEH and MPB, 2024-2025. This is an estimate, not an appraisal; condition, variant, and service history move the number.

• The vintage lens buying checklist

Does the Nikon Nikkor 50mm f/1.2 AI-S work on Sony E, Fuji X, and MFT?

Yes. Nikon F has a 46.5mm register and every mirrorless mount is shorter (16mm to 20mm), so a simple Nikon F adapter reaches infinity with no optics. On a full-frame body the Nikon Nikkor 50mm f/1.2 AI-S frames as a 50mm lens; on APS-C (1.5x) it frames like a 75mm, on Canon APS-C (1.6x) like a 80mm, and on Micro Four Thirds (2x) like a 100mm. Plain adapter ring for every manual-aperture Nikkor. Pre-AI lenses mount freely on adapters; their only compatibility problem is with later Nikon bodies whose meter-coupling tab they can bend.

• Adapt Nikon F to Sony E
• Adapt Nikon F to Fuji X
• Adapt Nikon F to MFT
• Adapt Nikon F to Canon RF
• Adapt Nikon F to Nikon Z
• Adapt Nikon F to L-mount

When was the Nikon Nikkor 50mm f/1.2 AI-S made?

Nikon made the Nikkor 50mm f/1.2 AI-S from 1981-2020s. That puts the Nikon Nikkor 50mm f/1.2 AI-S 22 years into the life of the Nikon F mount, which appeared in 1959 on the Nikon F.

What is the optical design of the Nikon Nikkor 50mm f/1.2 AI-S?

The Nikon Nikkor 50mm f/1.2 AI-S uses 7 elements / 6 groups, Double Gauss. Double Gauss designs are near-symmetrical six- or seven-element formulas that support fast apertures with good correction; fast versions show glow from spherical aberration and swirl from mechanical vignetting wide open.

Which lenses are similar to the Nikon Nikkor 50mm f/1.2 AI-S?

Close alternatives in the same focal class are the Pentax SMC Pentax 50mm f/1.2 (50mm f/1.2, $300 to $800), the Carl Zeiss Planar T* 50mm f/1.4 (C/Y) (50mm f/1.4, $120 to $420), and the Asahi Pentax Super-Takumar 50mm f/1.4 (50mm f/1.4, $80 to $400). The Pentax SMC Pentax 50mm f/1.2, The Carl Zeiss Planar T* 50mm f/1.4 (C/Y), and The Asahi Pentax Super-Takumar 50mm f/1.4 cost less on the used market.

• Nikon Nikkor 50mm f/1.2 AI-S vs Pentax SMC Pentax 50mm f/1.2
• Nikon Nikkor 50mm f/1.2 AI-S vs Carl Zeiss Planar T* 50mm f/1.4 (C/Y)
• Nikon Nikkor 50mm f/1.2 AI-S vs Asahi Pentax Super-Takumar 50mm f/1.4