Review on 💡 Commlite CM-AEF-MFT Booster: Canon EF Lens to M4/3 Micro Four Thirds 0.71x Speed Booster Autofocus Adapter for Panasonic GH4, GH5, GH5S, GF6, GF1, GX1, GX7 & Olympus E-M5, E-M10, E-PL5 by Tony Meyer

As you know, speed boosters are very cool. With my Sigma 18-35mm it reads at f/1.3. The field of view in 4K is slightly more cropped compared to Super 35 on the C100. At 1080p it's a bit wider. I do notice some vignetting at 1080 resolution, but it's serviceable. Fits snugly on an 18-35mm lens. Easy game when connecting to the camera. (G7) Photos show a Sigma 18-35mm f/1.3 lens at 18mm. and without 18mm speed booster. I need to do more testing to prove this, but I find that the picture quality with this adapter is slightly degraded compared to the passive adapter. There seems to be some ghosting and loss of sharpness. I will continue testing this adapter.