K&F Concept M39-FX – M39 Lens to Fujifilm X Mount Adapter

The K&F Concept M39-FX adapter mounts lenses with the M39 (Leica LTM) thread on cameras with the Fujifilm X mount. It is purely mechanical, with no electronic contacts: focusing is done by hand on the lens and the aperture is set with the lens aperture ring, while infinity focus is retained. The all-metal adapter is precisely machined.

Leica M39 lenses on Fujifilm X bodies

With the M39-FX adapter, Leica M39 lenses can be used on a modern Fujifilm X body with everything it offers – a viewfinder with magnification for precise manual focusing, sensor stabilisation if the body has it, and current recording formats. The length of the adapter matches the difference in flange distance between the two systems, so the lens focuses across its whole range, all the way to infinity.

Solid metal construction

The adapter is all-metal, made of brass and aluminium. Precise machining ensures a firm connection without play.

Manual focus and aperture

The adapter has no electronic contacts and the camera does not recognise the lens – autofocus, aperture control from the body and lens data in EXIF do not work. Focus with the ring on the lens; magnification or focus peaking in the viewfinder makes precise focusing easier. The aperture is set with the aperture ring on the lens; lenses without an aperture ring cannot be stopped down with this adapter.

First use

Before the first shot, enable shutter release without a lens in the camera menu (on Sony “Release w/o Lens”, a similar option on other brands). Otherwise the body will not treat the adapter without contacts as an attached lens and will not release the shutter.

Heavy lenses

Support heavy lenses with a lens foot or a tripod so that their weight is not carried by the adapter mount alone.

Compatible cameras

Fujifilm X-A1, X-T1, X-Pro2 and other bodies with the Fujifilm X mount.