Metabones just announced a new Canon EF to Sony NEX plus a all new range of speed booster ULTRA adapters. The ULTRA is featuring a new optical design incorporating ultra-high index tanatalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting. The ULTRA (like its original model) will turn any APS-C sensor into an equivalent full frame one with 1 stop gain in brightness. Here are the key features (taken from metabones press release): Increase maximum aperture by 1 stop. Increase MTF. Makes lens 0.71x wider. Advanced 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass by Caldwell Photographic in the USA (patent pending). Electronic integration of aperture diaphragm, controlled by or from the camera body. Partial autofocus support for late-model (post-2006) Canon-brand lenses. Powered by camera body. No external power source required. High performance 32-bit processor and efficient switched-mode power supply. The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads. Via EOSHDRead more
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