Lens Mount Adapter K&F SB6331 — K&F Adapter for Olympus/Panasonic Micro Four Thirds (M4/3) to M42

The K&F SB6331 lens mount adapter allows photographers to mount M42 screw-mount lenses on Olympus and Panasonic Micro Four Thirds (M4/3) mirrorless cameras. This precision-machined mechanical adapter provides a stable, snug connection between legacy M42 lenses and modern M4/3 bodies, preserving manual aperture control and manual focus operation. It does not include electronic contacts, so exif transmission and autofocus are not supported; the adapter is designed to maintain optical alignment and flange distance for accurate focusing across the focusing range.

Advantages

The adapter is made to deliver reliable physical coupling with minimal play, enabling use of vintage, third-party, or specialty M42 lenses on M4/3 systems. Its compact, lightweight construction keeps added bulk and weight low, and the metal build offers durability for frequent mounting and unmounting. By retaining full mechanical control over aperture and focus on the lens itself, the adapter supports creative manual shooting and the characteristic rendering of classic optics.

Suitable for

• Photographers who want to use vintage M42 prime lenses on Olympus or Panasonic M4/3 cameras
• Macro and close-up shooters using adapted M42 optics for specific rendering
• Documentary and street photographers preferring manual focus and manual aperture control
• Videographers seeking the distinct bokeh and color rendition of legacy glass on M4/3 bodies

Key specifications

• Mount conversion: M42 screw mount (lens) to Micro Four Thirds mount (camera)
• Construction: metal body for durability and stable fit
• Connection type: mechanical coupling only, no electronic contacts
• Compatibility: Olympus and Panasonic Micro Four Thirds mirrorless cameras
• Weight and dimensions: compact and lightweight design for minimal added bulk

How to use

To use the adapter, first remove any rear lens cap from the M42 lens and align the lens threads with the adapter's M42 screw mount. Secure the lens by screwing it in until it seats firmly. Align the adapter's M4/3 bayonet with the camera mount and rotate it until it locks into place with the camera's mount click. Set the camera to allow shooting with non-electronic lenses if required (check camera menu for mechanical lens settings). Focus and set aperture directly on the mounted lens; use focus magnification or focus peaking on the camera to assist manual focusing as needed.

Usage recommendations

For best results, verify that the M42 lens rear element is clean and free of damage before mounting. Use manual exposure modes or aperture-priority on the camera to control exposure accurately. When composing critical focus, enable focus assist tools on the camera. If light leaks or minor vignette appear with certain lenses, stop down the aperture slightly or use lens-specific shading correction in-camera or in post-processing.