While primarily designed for video, it can also be used for still photography when the camera is configured to APS-C mode. The Speed Booster ULTRA boasts an advanced 5-element/4-group optical design by Caldwell Photographic Inc., incorporating ultra-high index tantalum-based optical glass. This innovative design ensures extraordinary optical performance, improved corner sharpness, less distortion, and reduced vignetting. With a magnification of 0.71 x, the Speed Booster ULTRA effectively reduces the crop factor of 4k video on EOS R and EOS RP. It's designed to work well with virtually all full-frame SLR lenses, transforming professional-grade f/ 2.8 zoom lenses into high-speed zooms and high-speed fixed focal length lenses into wider, faster lenses.
The adapter also increases the maximum aperture by 1 stop, with a maximum output aperture of f/ 0.9, and increases MTF. It features autofocus with adjusted AF speed, dual-pixel autofocus (DPAF), video AF support, and image stabilization (IS) lens support. The built-in multi-function Control Wheel allows for assignable functions such as ISO, shutter speed, or aperture control, and depth-of-field preview. Constructed from durable aluminum alloy and brass with chromium plating, the adapter is designed to withstand the rigors of professional use. It features a detachable tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads, and a rubber gasket to protect the RF mount connection from dust and moisture.
Please note that this adapter does not support 60p (FHD) video, Canon EF-S Lens, APS-C Lens, lens correction such as peripheral shading, CA and distortion, focus confirmation "chip" (e. g. Dandelion), M42 screw mount adapters, or stacking non-Metabones/non-Conurus mount adapters on top. Experience the difference the Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera T Speed Booster ULTRA 0.71 x Adapter can make in your filmmaking today.


