Bring classic Leica M39 glass to your Fujifilm X system.

The K&F Concept KF06.104 lens adapter allows Leica M39 screw mount lenses to be mounted onto Fujifilm X-mount mirrorless cameras. Designed for photographers who appreciate the optical character of vintage rangefinder lenses, this adapter provides a precise mechanical connection between classic M39 lenses and modern Fuji X digital bodies.

Leica M39 lenses, often referred to as Leica Thread Mount or LTM lenses, are known for their distinctive rendering, compact size and mechanical craftsmanship. With this adapter, you can continue using these legacy optics on cameras such as the Fujifilm X-T, X-Pro, X-E and X-A series, extending the creative life of your collection.

Designed for Manual Photography
This is a fully mechanical adapter with no electronic contacts. Autofocus, electronic aperture control and EXIF transmission are not supported. All focusing and aperture adjustments are performed directly on the lens, maintaining the traditional rangefinder shooting experience.

Many photographers intentionally choose manual lenses for their tactile precision and creative control. When paired with Fuji’s focus peaking and magnification tools, manual focusing becomes accurate and highly practical, even for critical work. The simplicity of a non-electronic adapter also ensures long-term reliability without firmware compatibility concerns.

Precision Construction and Secure Fit
The KF06.104 is manufactured from durable brass and aluminium alloy components. The Leica M39 screw thread is precisely machined to ensure a snug and accurate fit, preventing wobble or misalignment. Correct flange distance is critical when adapting lenses, and this adapter is engineered to maintain proper spacing so that focus calibration remains accurate.
Internally, the matte black finish reduces the risk of internal reflections, helping to maintain contrast and minimise flare when shooting in strong light. There are no optical elements inside the adapter, meaning your lens performance remains unchanged. Image quality is determined entirely by the lens and camera sensor combination.

Infinity Focus Accuracy
Achieving true infinity focus is essential when adapting manual lenses. The KF06.104 is designed to ensure that Leica M39 lenses can focus accurately to infinity on Fujifilm X cameras. This makes it suitable for landscape, architectural and travel photography where distant focus precision is non-negotiable.
Because Fuji X cameras use an APS-C sensor, the effective field of view will reflect the camera’s 1.5x crop factor. For example, a 50mm Leica M39 lens will provide an angle of view equivalent to approximately 75mm in full-frame terms. The focal length itself does not change, only the field of view due to the sensor size.

Compact and Balanced for Mirrorless Use
Leica M39 lenses are typically compact and lightweight, making them well suited to Fujifilm’s mirrorless bodies. The adapter maintains a slim profile, adding minimal bulk between the lens and camera. This preserves the handling characteristics of smaller X-series cameras and supports discreet street and travel photography setups.

The lightweight construction also ensures that the camera mount is not subjected to unnecessary strain, particularly when using smaller prime lenses common in the M39 system.
A Practical Way to Expand Your Creative Toolkit

For photographers who already own Leica M39 lenses or enjoy sourcing vintage optics, the K&F Concept KF06.104 provides a reliable and cost-effective bridge to the Fujifilm X system. It enables you to explore classic rendering styles, distinctive bokeh and vintage contrast characteristics while benefiting from modern digital sensors and in-camera tools.

If you value mechanical precision and want to extend the usefulness of your Leica M39 lenses, this adapter offers a straightforward and dependable solution. Order the K&F Concept KF06.104 today and bring timeless rangefinder optics to your Fuji X camera.

SPECIFICATIONS:
Material: Brass and aluminium alloy
Colour: Black
Weight: 90g
Dimensions: Approx. 60mm x 60mm x 25mm
Lens Mount: Leica M39 screw mount
Camera Mount: Fujifilm X-mount
Electronic Communication: No
Infinity Focus: Supported
Optical Elements: None
Mount Type: Screw thread to bayonet