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Canon full-frame cameras have used the EF lens mount since 1987. In comparison with that mount, the RF mount's inner diameter is the same at 54 mm. [1] The RF mount's flange focal distance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm.
L lenses are often "fast", with maximum apertures commonly f / 2.8 or f / 4, and, with the exception of the RF 100–500 mm f/4.5–7.1L IS USM lens and the RF 1200 mm f/8L IS USM lens, never exceeding f / 5.6. Prime L lenses have a much larger maximum aperture, such as Canon's current 50mm and 85mm L lenses with maximum apertures of f / 1.2.
A 9 bladed maximum aperture of f / 4.5, gives this lens the ability to create depth of field effects. The optical construction of this lens contains 8 lens elements, including one fluorite lens element, and one UD (Ultra low Dispersion) lens element. This lens uses an inner focusing system, powered by a ring type USM motor. The front of the ...
Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
For example, a 100 mm to 400 mm lens may have a maximum aperture of f/4.0 at the 100 mm end but will diminish to only f/5.6 at the 400 mm end of the zoom range. Zoom lenses with constant maximum apertures (such as f/2.8 for a 24–70mm lens) are usually reserved for lenses with higher build quality and are thus more expensive than those with ...
A Canon EF 100-300mm f/5.6L zoom lens. The EF 100–300mm refers to three telephoto zoom lenses produced by Canon. They are of the EF lens mount that is compatible with the EOS line of cameras. The three versions are: f / 5.6; f / 5.6L; f / 4.5–5.6 USM; The two 5.6 versions were contemporaries, launched at the beginning of the Canon EOS system.
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