The Metabones Canon EF lens to Micro Four Thirds T ULTRA 0.71x Speed Booster uses an advanced 5-element 4-group optical design incorporating ultra-high index tantalum-based optical glass.
This Metabones Speed Booster is a well made and quite brilliant adapter for those who’d like to mount Canon EF-mount lenses on Micro Four Thirds cameras. Not only does it allow control of the aperture in a Canon lens from a Micro Four Thirds camera, it supports image stabilisation where present and allows the camera to record EXIF data. With a magnification of 0.64x and advanced 6-element optical design users can transform Micro Four Thirds cameras into super-35 format 4K cine cameras while achieving extraordinary optical performance at apertures up to an incredible f/0.80. Autofocus is also supported, but we should point out it’s worth double-checking camera compatibility first.
This is a useful solution for anyone wishing to use Canon EF mount lenses on Sony’s full-frame mirrorless cameras without losing all-important lens functionality such as aperture control, autofocus or optical image stabilisation. Roughly the same size as a Canon EF 1.4x extender, it adds just 150g in weight to camera setups, has an on/off switch to control the camera’s in-body stabilisation and supports most autofocus functionality on Sony A7-series cameras, including real-time Eye AF. Users shouldn’t expect EF-mount autofocus lenses to focus as fast on a Sony camera as they do on a native Canon body. Generally speaking, autofocus response is adequate for subjects that don’t move quickly or are erratic in their behavior.
Adaptor with revolutionary optics to increase aperture and width of lens.
Sigma’s MC-11 mount converter is a solution to being able to use Canon and Sigma EF-mount lenses on Sony E-mount cameras. It’s well made as we’ve come to expect from the Japanese manufacturer and is relatively slim, adding just 2.5cm to the depth of the camera. Its key characteristic is the way it communicates the information that’s required between camera and lens to enable autofocus functionality and exposure control. It does have a few limitations though. It’s not weather sealed, its performance isn’t guaranteed for all adapted lenses and it works best with Sony E-mount cameras that feature phase detection autofocus.
The SIGMA mount converter MC-21 allows more freedom of choice for L-Mount cameras from SIGMA, Leica Camera and Panasonic, enhancing the extensibility of the L-Mount system.