The new Speed Booster ULTRA m43 uses an advanced 5-element 4-group optical design incorporating ultra-high index tantalum-based optical glass. The new design is specifically optimized for the Micro Four Thirds sensor and filter stack, and as a result achieves an astonishing level of performance that sets a new standard for focal reducers.
the Speed Booster ULTRA m43 has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless Micro Four Thirds mount cameras from 2.0x to 1.4x. However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is almost perfectly corrected for use with all fullframe SLR lenses regardless of aperture. The Speed Booster ULTRA m43 will also work extremely well with many DX and APS-C format lenses provided the image circle of the lens is large enough. Optical performance of the new Speed Boosters is so good that the MTF of any lens attached to it will be improved. Even the latest generation of ultra-high performance SLR lenses such as the Zeiss Otus series can be improved by adding a Speed Booster ULTRA m43.
|Increase maximum aperture by 1 stop
|Increase MTF of any lens attached
|Makes lens 0.71x wider
|Patented 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass by Caldwell Photographic in the USA
|Can be powered either by camera body or by third-party external 5V power source (not included)
|Iris/aperture controlled by the camera body
|Image stabilization (IS) lens support
|Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
|EXIF (focal length, aperture, zoom range)
|Distance and zoom display on camcorders (requires lenses supporting distance information)
|Detachable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads.
|Flocking material coating to reduce the internal reflection.
EF-S lenses require modification to fit (but third party DX lenses can be used without modification)
No video AF for Olympus
AFC (continuous AF) and AFF (flexible AF) modes are not supported
Panasonic video AF may hunt more than a native lens
No support for in-camera correction such as peripheral shading, CA and distortion
Designed to cover a 23mm image circle but not enough to cover Super35 so JVC GY-LS300 needs to have VSM configured to 86% (UHD)