Nikon 5cm (50mm) f/2 NIKKOR-S Non AI Nippon Kogaku Japan PAT. Pend Manual Focus Lens {52} Early Version

50mm f/2 NIKKOR-S Non AI, early Nippon Kogaku provenance.

This early NIKKOR-S 5cm f/2 carries the Nippon Kogaku Japan marking, placing it among the lenses made before the Nikon name fully took hold on production. The Non AI designation matters practically: this lens predates Nikon's Automatic Indexing coupling system, so it meters natively only on bodies that support Non AI glass, but it adapts readily to modern mirrorless systems with the right F-mount adapter, where you're shooting in stop-down or manual exposure mode anyway. The 52mm filter thread is a Nikon classic, compatible with decades of filters already in most kits.

The f/2 maximum aperture gives you workable low-light capability and enough subject separation for portraiture or street work. What draws shooters to lenses like this isn't raw speed or modern clinical correction, it's the character that comes from an earlier optical formula, rendered at a time when Nippon Kogaku was building the foundation of what became one of the most trusted lens lineages in photography. At 50mm, you're working in the most natural focal length for full-frame coverage, and the PAT. Pend designation marks this as an early production run, making it a historically grounded piece of Nikon's optical heritage.

Who It's For

Film photographers shooting Nikon F-mount bodies will find this works natively with Non AI-compatible cameras, giving them a historically significant 50mm without any modification. Mirrorless shooters on Sony, Fujifilm, or Nikon Z systems who already own a F-mount adapter can run this at f/2 with manual exposure and get a rendering that differs noticeably from modern glass. Collectors focused on early Nikon history will value the Nippon Kogaku Japan marking and the PAT. Pend early-version designation as documentation of the brand's origins. Documentary and street photographers who prefer a compact, manual 50mm benefit from the focal length's natural perspective and the simplicity of a lens with no electronic dependencies.

Key Features

• 50mm focal length, f/2 maximum aperture
• Manual focus, Non AI coupling design
• Nikon F mount, Pre-AI specification
• 52mm filter thread, standard compatibility
• Nippon Kogaku Japan marking, early production
• PAT. Pend designation, patent-pending tooling

FAQ

Will this Non AI lens work on modern Nikon DSLRs?

It mounts physically via the F-mount, but you'll lose all metering and autofocus capabilities on modern bodies. For DSLRs, you're limited to manual exposure and stop-down metering. On mirrorless systems with an F-mount adapter, this becomes much more practical - you meter and shoot in manual mode naturally.

What does the PAT. Pend marking mean?

Patent Pending indicates this is an early production run, before the design received final patent approval. It's a marker of when the lens was made and adds to its historical value within the NIKKOR-S lineup.

Can I use modern 52mm filters on this lens?

Yes. The 52mm thread is a Nikon standard that's been in use for decades, so any 52mm filter you already own fits directly.

How does the f/2 aperture compare for low-light work?

It's workable for available-light street or indoor shooting, especially on faster film or higher ISO. It won't match modern f/1.4 glass, but it gives you decent subject separation for portraiture and enough speed for most situations without a tripod.

What's the practical difference between this Non AI lens and later AI versions?

The Non AI design predates the Automatic Indexing coupling ridge added to later NIKKOR glass. This means it only meters natively on bodies that support Non AI lenses - primarily older film cameras. Modern bodies require manual metering, which isn't a limitation if you're shooting in manual exposure mode anyway.

Why does the Nippon Kogaku Japan marking matter?

It places the lens in Nikon's early manufacturing period, before the Nikon brand name dominated all production markings. It's a historical touchstone in the NIKKOR lineage and signals genuine early-run provenance.