Product Description
Sharper corners, less distortion, reduced vignetting
New optical design: advanced 5-element/4-group optical design incorporating
ultra-high index tanatalum-based optical glass to achieve extraordinary optical
performance with improved corner sharpness, distortion and reduced vignetting.
Like the revolutionary original Metabones Speed Booster announced in January
2013, the Speed Booster ULTRA has a magnification of 0.71x, and so it
effectively reduces the crop factor of mirrorless cameras with DX-sized sensors,
such as Sony E-mount and Fuji X-mount cameras, from 1.5x to 1.07x. However, the
new ULTRA design makes very effective use of exotic materials at the furthest
limit of glassmaking technology, and as a result is well corrected for use with
virtually all fullframe SLR lenses regardless of exit pupil distance. Thus, the
Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom
lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon to
produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively.
Similarly, high-speed fixed focal length lenses such as a 50mm f/1.2 will be
transformed into a 35.5mm f/0.9 lens with excellent contrast and resolution from
the center all the way to the edges of the image.
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