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Black metal M42 to Leica L39 lens adapter with knurled ring

ProOPTIC

ProOPTIC M42 to Leica L39 lens mount adapter

SKU CH-XEHW-VB1SR

Adapts M42 screw-mount lenses to Leica 39 mm bodies with a precision metal-alloy build weighing 38.0 g

  • Adapt M42 lenses to Leica 39M bodies
  • Precision threads preserve image quality and prevent light leaks
  • Metal alloy construction ensures durable, reliable connection
  • Weighs only 1.3 oz (38.0 g) for maximum portability
  • Knurled ring provides secure, slip-free lens mounting

M42-to-L39 lens adapter

This ProOPTIC adapter lets photographers mount any M42 screw-mount lens onto a Leica 39M camera body. Precision-engineered threads secure the connection and prevent light leaks so image quality is preserved. The all-metal alloy construction weighs 1.3 oz (38.0 g) and adds minimal bulk to a portable kit. A knurled ring gives a slip-free grip for quick, safe lens changes.

Expanding a Leica 39M system

The adapter replaces the need for dedicated L39 lenses by unlocking the vast pool of affordable M42 optics. The jump is worth it when you already own M42 glass or want vintage character on a Leica body without investing in native lenses. It is not for shooters who require electronic aperture control, autofocus coupling or EXIF data transfer because the mechanical link provides none of those functions.

Mechanical limits of the screw mount

The M42-to-L39 interface relies solely on threaded engagement, so infinity focus depends on exact flange-distance matching between the specific lens and body. No electrical contacts means aperture stays manual and the camera meter cannot read the lens setting. Builders who need a second adapter for a different mount or who want a built-in focusing helicoid should look elsewhere because this unit is a single, fixed-length ring.

How it compares

Measured against everything we stock in Camera Extras & Accessory Packs, at today’s prices. Recalculated every night.

Price $25.99
Cheaper than about 65% of the 2,266 comparable items (median $39.99).

Specifications

No published specifications for this item yet.

Questions about this item

What thread sizes does this adapter connect between?

It bridges an M42 × 1 mm lens thread to a Leica L39 × 1 mm body mount, letting you use any M42 screw-mount lens on a 39 mm Leica camera body.

Which way round do the threads go and where is the knurled ring?

Screw the male L39 thread into the camera body first, then thread the M42 lens into the female side; the knurled ring sits on the adapter barrel for grip while tightening.

Will the metal threads wear out or need lubrication over time?

The all-metal alloy threads are designed for repeated mounting without lubrication; keep them clean and store the adapter capped to prevent grit damage.

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