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Smith Enterprise builds 30 mm scope rings and scope mounts primarily for use on AR-15, M16, M1A and M14 rifles. In 2005, Smith was the only company in the United States to produce scope rings and mounts via wire-cut electrical discharge machining (EDM). [20]
Zoom lenses are often described by the ratio of their longest to shortest focal lengths. For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 4:1 or "4×" zoom. Typical zoom lenses cover a 3.5× range, for example 24–90 mm (standard zoom) or 60–200 mm (telephoto zoom).
Extension tubes without electrical contacts will not allow an electronic automatic camera to control the lens, thus disabling autofocus and in some cases forcing a user to shoot wide open unless the lens offers manual aperture control. More expensive extension tubes contain electrical contacts allowing the user to use autofocus and ...
Newer lenses with Sigma SA-mount can be used on newer Sony E-mount cameras (for example, the Sony ILCE-7 series, the ILCE-5000, ILCE-6000 etc.) using the Sigma MC-11 SA-E mount adapter, introduced in 2016. (A similar Sigma MC-11 EF-E adapter is available to mount Canon EF-mount lenses on Sony E-mount cameras.) The adapters support autofocus ...
The EF 100–400 mm f / 4.5–5.6L IS USM is a professional EF mount telephoto zoom lens manufactured by Canon Inc. The first version of this lens was announced in September 1998, and an updated version was announced in November 2014. It is a high performance telephoto lens most often used for sports and wildlife photography.
Early 20th century Ventriloquism Guide and novelties catalogue. Johnson Smith Company (Johnson Smith & Co.) was a mail-order business established in 1914 by Alfred Johnson Smith that sold novelty items and gag gifts such as miniature cameras, invisible ink, x-ray goggles, whoopee cushions, fake vomit, and joy buzzers.
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