- Increase maximum aperture by 1 1/3 stop
- Increase MTF
- Makes lens 0.64x wider
- Patented 6-element/4-group optical design by Caldwell Photographic in the USA
- Supports 4k video mode with DX lenses
- Auto focus on Panasonic Micro Four Thirds cameras
- Iris/aperture controlled by the camera body
- Image stabilization (IS) lens support
- Electronic manual focusing
- EXIF - focal length, aperture, zoom range
- Distance and zoom display on camcorders - requires lenses supporting distance information
- The interior is painted with flocking coating to further reduce the internal reflection
A Micro-4/3 mount Speed Booster adapter designed exclusively for the Panasonic GH4 and other selected Micro Four Thirds cameras, with a magnification of 0.64x. The Speed Booster XL 0.64x uses an advanced 6-element optical design to achieve extraordinary optical performance at apertures up to an incredible f/0.80, a record for Micro Four Thirds format.
The Speed Booster XL 0.64x reduces the full-frame crop factor of the Panasonic GH4 from 2.0x to 1.28x, thus effectively transforming these cameras into APS-H format. When the GH4 is used in Cinema 4k video mode the horizontal full frame crop factor is reduced from 2.34x to 1.50x, thus effectively transforming the GH4 into a super-35 format 4k cine camera. In addition, the speed of any attached lens is increased by 11/3 stops, with a maximum output aperture of f/0.80 when an f/1.2 lens is used. For example, a 50 mm f/1.2 becomes a 32 mm f/0.80, which is a faster aperture available for full size Micro Four Thirds format.