VILTROX EF-M2II Focal Reducer Booster Adapter Auto-Focus 0.71x for Canon EF Mount Series Lens to M43 Camera GH4 GH5 GF6 GF1 GX1 GX7 E-M5 E-M10 E-PL5

This really works and I have no idea how Metabones can be even better. Best benefit for the price. It worked neatly with my Sigma 18-25mm.

quick reliable and great value

It’s hard to express just how much I love this speedbooster! Never had a problem with it and works great on my BMPCC 4K.

This adapter is incredible for the money. However you will need to rotate the element inside the unit to achieve proper infinity focus. I had to update the firmware for it to work with the pocket 4K. Finally, do not use this adapter past the lenses advertises t stop. For example on the sigma 18/35, this adapter stays sharp all the way to f1.8, but when you use the “boosted” range of f1.2 to f1.8, it becomes a blurry mess. This is where the metabones is better. However it is way more expensive and if you’re happy doing the infinity focus tweak as well as using it within what the lens was designed for, you’re going to be extremely happy. Perfect pairing for the pocket 4K, as dropping the money on the metabones for the pocket 4K puts you at the same price as just getting a pocket 6k anyways.

Good