Take your filmmaking to the next level with the Canon Ef Lens to Rf-Mount T Cine Speed Booster Ultra 0.71x Adapter in sleek black. This innovative adapter is designed to adapt Canon Ef mount full-frame lenses to the cutting-edge Canon Rf mount, making it an essential tool for filmmakers seeking to optimize their Eos R, Eos Rp, and Eos C70 cameras.The Speed Booster Ultra 0.71x significantly reduces the 4k video crop factor of Eos R (1.75x) and Eos Rp (1.63x) to 1.24x and 1.15x respectively. This allows for a field of view that closely mirrors still photo mode, enhancing the versatility of your camera. While primarily designed for video, this Speed Booster can also be utilized for still photography when the camera is set to Aps-c mode.This adapter boasts an advanced 5-element/4-group optical design by Caldwell Photographic Inc., featuring ultra-high index tantalum-based optical glass.