K&F Concept M39-E – M39 Lens to Sony E Mount Adapter K&F Concept

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The K&F Concept M39-E adapter lets you mount M39 (Leica LTM) screw-mount lenses on Sony E mount cameras. The precisely machined adapter holds the lens firmly with no play. It is a purely mechanical adapter without electronic contacts: focusing is manual, the aperture is set with the ring on the lens, and infinity focus is retained.

Which lenses and cameras

On the lens side it takes M39 (Leica LTM) screw-mount lenses. On the body side it fits Sony E mount cameras, such as the α7, α9, α1, α6000 and NEX series or the FX3, FX6, FX9, FS5 and FS7 camcorders.

Build and mounting

The adapter is precisely machined, so it sits firmly and without play. A red dot makes mounting easy: screw the lens into the adapter, then align the dots and turn the adapter on the body until it clicks.

Manual operation

The adapter has no electronic contacts, so the camera does not recognise the lens and neither autofocus nor automatic aperture control works. Focusing is manual and the aperture is set with the aperture ring of the lens. Infinity focus is retained. Before first use, enable shutter release without a lens in the camera menu (e.g. “Release w/o Lens” – the name varies by model), otherwise the camera will not fire.

Tips for use

• On telephoto lenses the infinity mark (∞) is deliberately offset slightly to allow for thermal expansion, so check infinity focus in the viewfinder or on the screen.
• On a body with an APS-C sensor the focal length is multiplied by roughly 1.5×, and a full-frame lens uses its sharp centre.

• 1 × K&F Concept M39-E adapter

• Type: manual lens adapter
• Lens side: M39 (Leica LTM) (screw)
• Camera side: Sony E
• Marking: M39-E
• Electronic contacts: no
• Focusing: manual
• Infinity focus: yes
• Aperture control: aperture ring of the lens
• Manufacturer code: KF06.251