I bought this adapter to pair with my Canon R5C. It is basically Meike’s version of Canon’s EF-to-RF drop-in variable ND adapter, but at roughly half the price, with both the variable ND and a clear filter included.

These days, I rarely use the VND because I often use front filters to control polarization. But as a video tool, the concept still makes a lot of sense: one drop-in ND solution that works across many EF lenses, regardless of front filter size.

When it comes to speed or compatibility, I have never noticed a meaningful difference between my Canon EF-to-RF adapter and this Meike adapter. Autofocus, aperture control, stabilization, and EXIF transmission have all worked properly for my use.

The main catch is workflow. You need either the clear filter or the ND inserted; you cannot treat it like an empty adapter and expect normal infinity focus. Also, when using a camera cage like my SmallRig setup, the cage design can make it impossible to swap the drop-in filter without first removing the lens. That is more of a cage issue than an adapter issue, but it is still worth knowing.

The Good:

• One drop-in VND works across many EF lenses with different filter sizes.

• Clear filter is included when you do not need the VND.

• You can purchase additional drop-in filters, including a CPL.

• Very useful for outdoor video exposure control.

• Keeps autofocus, aperture, IS, and EXIF communication.

• Much cheaper than Canon’s official drop-in VND adapter.

The Bad:

• Clear/ND filter management becomes part of the workflow.

• The adapter should not be used empty if you need normal infinity focus.

• Camera cages can block the drop-in filter slot, forcing you to remove the lens first.

• If you need polarization control, front filters may still be the better option.

• Get it if adapted EF lenses are still part of your RF video kit.

• Get it if outdoor video and consistent shutter speed matter.

• Get it if you want one ND solution across many EF lenses and do not require polarization control.

• Pass if you mostly shoot stills.

• Pass if your cage setup blocks the drop-in filter slot and you need to swap filters quickly.

• Pass if you are moving fully to native RF lenses and front filters.