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  2. Helios (lens brand) - Wikipedia

    en.wikipedia.org/wiki/Helios_(lens_brand)

    Helios-44M lenses have been produced at KMZ since 1971, and the main differences from the base model Helios-44 concern only the aperture control method, the number of aperture blades and the resolution of the lens: - Helios-44M has an 8-blade diaphragm; - Helios-44M has a jumping diaphragm device, unlike Helios-44, which has only manual control ...

  3. Double-Gauss lens - Wikipedia

    en.wikipedia.org/wiki/Double-Gauss_lens

    The design is presently used in inexpensive-but-high-quality fast lenses such as the Sony FE 50mm f / 1.8, the Canon EF 50mm f / 1.8 and the Nikon 50 mm f / 1.8D AF Nikkor. It is also used as the basis for faster designs, with elements added, such as a seventh element as in both Canon [ 35 ] and Nikon's 50 mm f / 1.4 offerings [ 36 ] or an ...

  4. Canon EF 50mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_50mm_lens

    Front and rear views of a Canon EF50mm f/1.4 USM. The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length.These lenses are based on the classic double-Gauss lens, [1] with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3 [1] and its faster cousins adding additional elements. [2]

  5. Carl Zeiss Planar 50mm f/0.7 - Wikipedia

    en.wikipedia.org/wiki/Carl_Zeiss_Planar_50mm_f/0.7

    The Carl Zeiss Planar 50mm f /0.7 is one of the largest relative aperture lenses in the history of photography. [1] The lens was designed and made specifically for the NASA Apollo lunar program to capture the far side of the Moon in 1966. [2] [3] [better source needed] [4]

  6. Hiduminium - Wikipedia

    en.wikipedia.org/wiki/Hiduminium

    R.R.58, also known as Aluminium 2618, comprising 2.5 copper, 1.5 magnesium, 1.0 iron, 1.2 nickel, 0.2 silicon, 0.1 titanium and the remainder aluminium, and originally intended for jet engine compressor blades, was used as the main structural material for the Concorde airframe, supplied by High Duty Alloys, it was also known as AU2GN to the ...

  7. MK 214A cannon - Wikipedia

    en.wikipedia.org/wiki/MK_214A_cannon

    The MK 214A was a 50 mm (1.969 in) calibre auto-cannon designed by Mauser Werke AG, for use on Messerschmitt Me 262 and Me 410 bomber-destroyers. [2]Intended for use on the Messerschmitt Me 262A-1a/U4, Mauser designed the MK 214, derived from the 5 cm Pak 38 anti-tank gun.

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