Metabones Canon EF Lens to Blackmagic Pocket Cinema Camera Speed Booster, 0.58x Magnification, 6 Elements in 4 Groups, f/0.74 Maximum Aperture

The Metabones Canon EF Lens to Blackmagic Pocket Cinema Camera Speed Booster adapts Canon EF lenses to Micro four Thirds mount, while using custom optics to increase the angle of view and the maximum aperture of the lens. It is designed specifically for the Blackmagic Pocket Cinema Camera and features built-in electronics which lets to set the lens aperture using the controls on the camera body. The Speed Booster works by shrinking the image circle of Canon EF lens down to better fit the smaller sensor of the Blackmagic Pocket Cinema Camera. This has the effect of making the angle of view of the lens 0.58x wider or, in other terms, reducing the crop factor of the camera from 3.02x to 1.75x.

When the Speed Booster concentrates the image circle from a lens, the brightness of the image is increased by 1 2/3 stops. This yields a maximum output aperture of f/0.74 when using a Canon EF f/1.2 lens. In addition to lens speed and angle of view, the Speed Booster also increases the lens' MTF or how faithfully the lens transfers detail from the object to the camera sensor. These increases in MTF are seen in the corners as well as the center of the images. To reduce strain on the Pocket Camera's MFT mount, the Speed Booster includes a removable Arca-type tripod foot to help support the weight of the adapter and lens. In addition to being compatible with Arca-type quick-release heads, it also has a 1/4"-20 threaded hole for mounting to other tripods, rigs or quick-release plates. The built-in electronics are powered by the camera body, so no additional power supply is needed. To reduce the drain on camera's battery, the Speed Booster uses an efficient switched-mode power supply, which continually switches between on and off states, only drawing power when it needs it.