Review on 💥 Enhance Your Canon EF Lens Performance with VILTROX EF-M2 Speed Booster Adapter - Auto Focus, 0.71x, M43 Camera Compatibility, USB Update Port by Aaron Shaw

Quality control is a big issue for Viltrox. I picked up this adapter recently and had problems right away. The first thing I noticed was a soft halo in my wide open shots. The footage was blurry and had chromatic aberrations. I went with f4 from f1.4 and the Viltrox looked slightly better but the reason I use fast glass is so I can shoot wide open in low light. I tried adjusting the Viltrox by rotating the inner lens but couldn't fix the blurry effect. I liked that it worked with most of my lenses on my BMPCC 4k, but note that this adapter does not work with EF f/1.2 lenses. I emailed Viltrox and was told this is a known issue. Anything above f/1.4 should work. If you have time to send them back and get others, you can get a good one that works well. But if you don't have time to mess with these things, just get metabones xl or ultra. I would only buy this adapter if you are really on a budget and need something ASAP. If you have a problem with yours I'll send it back and write to Viltrox.