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Some lens adapters include a special optical element called a telecompressor, focal reducer, or more recently a "speed booster", a genericised trademark that refers to the Metabones Speed Booster line of lens adapters. [2] This type of adapter is designed to reduce focal length, increase lens speed, and in some instances improve MTF performance.
A telecompressor or focal reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF) performance. It is also widely known under the name “Speed Booster”, which is the commercial name of a line of telecompressors by the manufacturer Metabones.
A telecompressor, also known as a speed booster, may be used to increase the speed of a lens with a corresponding reduction to its focal length. For example, the Metabones 0.58x BMPCC speed booster may be combined with a f / 1.2 lens to produce f / 0.74. [3]
On August 23, 2018, Nikon announced the first three lenses for the Z-mount, one of which was the Nikkor Z 24-70 mm f /4 S (along with the Nikkor Z 35 mm f /1.8 S and Nikkor Z 50 mm f /1.8 S). [2] [3] The lens has a retractable design, making it more compact when not in use. The lens comes with a bayonet-type lens hood (HB-85).
A focal reducer is a device which inserts between main lens and camera and shrinks image circle while simultaneously increasing the f-stop of the lens. The downside is that only lenses from other systems with longer flange distance are accepted. Native E-mount lenses are not supported. Metabones Speed Booster, from full-frame SLR to APS-C, 0.71x
Teleconverters need a fast lens for fast, reliable autofocus. Depending on brightness, contrast and needed autofocus-speed, one should have a minimum total aperture between f / 11 and f / 5.6. A total aperture of f / 8 corresponds to a lens aperture of f / 5.6, f / 4 and f / 2.8 with a 1.4x, 2x and 3x
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