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The R mount was used on Canon's first single lens reflex (SLR) camera. The mount employed a "breech lock" system to attach the lens to the camera body. [1] The R mount was discontinued in 1964 and replaced with the Canon FL lens mount. [2] Many mirrorless interchangeable-lens cameras are able to use Canon R lenses via an adapter.
R4 (also known as Revolution for DS) is an unlicensed flash cartridge for the Nintendo DS handheld system. It allows ROMs and homebrew to be booted on the Nintendo DS handheld system from a microSD card.
The camera is the first of Canon's new EOS R system, and the first to use the RF lens mount. The "R" stands for "Reimagine optical excellence". The EOS R features a 30.3 megapixel CMOS sensor, an OLED viewfinder and an articulating LCD touchscreen. Autofocus uses dual-pixel technology, and "Eye Detection AF" automatically focuses on human faces ...
The design of the lens is required to work effectively with light passing from near focus to far focus - exactly the reverse of a camera lens. This demands that internal light baffling within the lens is designed differently and that the individual lens elements are designed to maximize performance for this change of direction of incident light.
Front view; it is a large camera. The battery tray forms a modest portrait grip. Lens removed, showing mount, reflex mirror. The Canon T90, introduced in 1986, was the top of the line in Canon's T series of 35 mm Single-lens reflex (SLR) cameras.
A ring is present around the opening on the camera which, when rotated, tightly locks the flange of the lens against the camera. A pin on the top side of the lens flange and a hole in the camera mount make sure the lens cannot be mounted at an angle.
Photographic lenses were sold initially with the G. Rodenstock brand. A 1912 catalog lists Eurynar double-anastigmat lenses with focal lengths ranging from 3 + 1 ⁄ 2 in (89 mm) to 19 in (480 mm) for various formats with maximum apertures of f /6.8; similar Eurynar lenses were offered with maximum apertures of f /5.4 and f /4.5.
When used on a camera with a field of view compensation factor of 1.6x, such as the Canon EOS 400D, they provide a narrower field of view, equivalent to an 800 mm lens mounted on a 35mm frame body. With a 1.3x body such as the Canon EOS-1D Mark III, they provide a less narrow field of view, equivalent to a 650mm lens mounted on a 35mm frame body.