Update to Original Speed Booster. The Ultra line of Speed Boosters features an improved four-group/five-element optical design with ultra-high index tantalum-based optical glass to achieve extraordinary optical performance. You’ll see noticeably improved corner sharpness, even less distortion, and reduced vignetting in the corners.

Canon EF Compatibility. This adapter was designed for crop-frame Sony E-mount cameras and camcorders like the Sony NEX-FS700R. It lets you use Canon EF-mount lenses on crop-frame Sony E-mount cameras. Please note that you can’t mount Canon EF-S lenses on this adapter, and that this adapter isn’t compatible with the full-frame Sony A7 series.

Wider Focal Length and Increased Aperture. This version of the Speed Booster widens the mounted lens’s focal length by 0.71x, effectively reducing the overall sensor crop factor from 1.5x to 1.07×. Additionally, the adapter increases the mounted lens’s maximum aperture by one stop.

Electronic Communication. The adapter’s mount has electric contacts that allow you to use compatible lenses’ aperture-control and image-stabilization functions. The adapter doesn’t require a separate power source, and EXIF data is transferred and embedded into your footage.

Sturdy Design with Built-In Tripod Foot. The aluminum barrel and brass mounts give it a solid feel, with an Arca-Swiss compatible tripod foot that lets you mount the adapter itself directly to a tripod. This ensures the lens’s weight doesn’t put additional stress on the camera’s mount.