Meike MK-EFTM-C Drop-in Filter Lens Adapter for Canon EF to EOS M

In this review the Meike MK-EFTM-C lens adapter is assessed for EOS M mirrorless shooters who want to use Canon EF and EF-S lenses while gaining a built-in filtration option. The single biggest reason to consider this adapter is the integrated drop-in variable neutral density filter that spans ND3 to ND500 (roughly 1.5 to 9 stops), which removes the need to carry separate screw-in filters for many shooting situations. The reviewer finds it most useful for run-and-gun video work and stills where exposure control and maintaining autofocus and aperture control matter.

Key Features

• EF/EF-S to EOS M compatibility: Lets photographers mount Canon EF and EF-S lenses on EOS M series bodies while keeping electronic control functions active.
• Variable ND filter included: The drop-in variable neutral density filter covers a wide range of light reduction, useful for long exposures and controlling depth of field in bright conditions.
• Additional filter holder: An extra holder lets users add a spare filter or swap filters quickly without dismounting the lens.
• Autofocus and aperture control: Built-in electronic contacts preserve autofocus support and allow aperture adjustment directly from the camera body.
• EXIF transmission: Gold-plated pins improve signal reliability so exposure and lens data are recorded correctly in files.
• Image stabilization support: The adapter maintains stability features to help make focus more accurate and images clearer when supported by the lens and camera.

Who It's For

The adapter is aimed at EOS M users who own Canon EF or EF-S lenses and want a compact way to add variable ND without swapping screw-in filters. It suits videographers and photographers who need quick exposure control, want to retain autofocus and aperture control, and prefer a tidy, integrated setup for street, run-and-gun, or time-lapse work.

It is less suitable for those who rely on bulky rigging where clearance can become an issue or users who require a precise filter solution for specialized matte boxes; some photographers reported compatibility quirks with certain cages and accessories, so test fit with any third-party SmallRig-style cage before committing.

Pros & Cons

Pros

• Built-in variable ND filter removes the need to carry multiple screw-in filters for many scenes.
• Maintains electronic aperture control and records EXIF data for accurate metadata.
• Extra holder adds flexibility for swapping or stacking filters without lens removal.
• Supports image stabilization to aid in sharper focus when available on lens or body.

Cons

• Some users report mixed functionality when combined with certain third-party cages, so mechanical clearance can be a limitation.
• The drop-in solution may not replace dedicated matte box filter workflows for heavy-duty professional rigs.

Specifications

Our Verdict

The Meike MK-EFTM-C adapter is a practical, cost-effective option for EOS M owners who want to use EF/EF-S glass and gain a wide-range variable ND without adding bulk. It is particularly good value for videographers and hybrid shooters who need to keep aperture control and autofocus while managing exposure. Buyers with custom cages or matte box setups should confirm mechanical compatibility first.

Frequently Asked Questions

Will autofocus still work?
Yes, the adapter supports autofocus via built-in electronic contacts, though performance depends on the specific lens and camera body pairing.

What ND range does it cover?
The drop-in variable filter covers ND3 to ND500, approximately 1.5 to 9 stops of light reduction.

Does it record EXIF data?
Yes, gold-plated pins transmit lens information so EXIF is recorded when supported by the camera and lens.