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2. Lens adapter - Wikipedia

   en.wikipedia.org/wiki/Lens_Adapter

   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.

3. Telecompressor - Wikipedia

   en.wikipedia.org/wiki/Telecompressor

   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.

4. Lens speed - Wikipedia

   en.wikipedia.org/wiki/Lens_speed

   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]

5. Expeed - Wikipedia

   en.wikipedia.org/wiki/Expeed

   The EI-137 variant in the Nikon D60 and Nikon D3000 – additionally found in the Nikon D40, Nikon D40x and Nikon D80 [6] – is based on the older Milbeaut M-3 in 180 nanometer technology (like all former Expeed/Milbeaut since 2001). It includes a FR-71 core with only 12-bit, two-channel image sensor readout, no DSP, slower memory and has a ...

6. Nikon F-mount teleconverter - Wikipedia

   en.wikipedia.org/wiki/Nikon_F-mount_teleconverter

   AF-S Teleconverter TC-14E II. The Nikon F-mount teleconverters are a group of magnifying lenses mounted between the lens and camera bodies using the Nikon F-mount.Currently, 1.4x, 1.7x and 2x converters are available separately; a fourth, the 1.25x, is available only with Nikon's newest 800mm supertelephoto lens.

7. Sony E-mount - Wikipedia

   en.wikipedia.org/wiki/Sony_E-mount

   Sony NEX-5 E-mount. The E-mount is a lens mount designed by Sony for their NEX ("New E-mount eXperience" [1]) and ILCE series of camcorders and mirrorless cameras. [2] The E-mount supplements Sony's α mount, allowing the company to develop more compact imaging devices while maintaining vignetting with 35mm sensors.