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  2. Canon EF 50mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_50mm_lens

    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 ]

  3. Breaker bar - Wikipedia

    en.wikipedia.org/wiki/Breaker_bar

    A breaker bar is able to create a larger amount of rotational force compared to a standard socket wrench. A standard breaker bar is strong enough to allow the user to apply up to 2,500 pound-feet (3,400 N⋅m) of torque without breaking the bar. [3] A high-end 1/2" socket wrench can withstand a maximum of 500 pound-feet (680 N⋅m) of torque. [4]

  4. History of the single-lens reflex camera - Wikipedia

    en.wikipedia.org/wiki/History_of_the_single-lens...

    Angénieux 35mm f/2.5 Retrofocus Type R 1 (France): first retrofocus wide angle lens for 35 mm SLRs (for Exaktas). [129] [130] Regular wide angle lenses (meaning short focal length lenses) need to be mounted close to the film. However, SLRs require that lenses be mounted far enough in front of the film to provide space for the movement of the ...

  5. Pin header - Wikipedia

    en.wikipedia.org/wiki/Pin_header

    1×6 pin header (one row) 1×6 female header (one row) A pin header (or simply, header) is a form of electrical connector.A male pin header consists of one or more rows of metal pins molded into a plastic base, often 2.54 mm (0.1 in) apart, though available in many spacings. [1]

  6. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.

  7. Cheater bar - Wikipedia

    en.wikipedia.org/wiki/Cheater_bar

    The cheater bar itself can become part of a de facto catapult with the worker in the line-of-fire. [1] If the over-torqueing results in the failure of any of the items in the jury rig, the fragments can injure workers in the line-of-fire. [2] The use of the cheater bar can result in component damage that can, in turn, harm workers. [3]