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The Canon Extender EF 1.4x II Image of the Canon 2x III Extender. The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, they will multiply the focal length of the lens by a factor of ...
Built-in 1.4× Extender [ edit ] Although not the first lens to be equipped with a built-in teleconverter , an honor that belongs to the older Canon FD mount 1200 mm f / 5.6L 1.4× lens, [ 4 ] [ 5 ] the EF 200–400 is the first to be for the EF mount, and the first to enter mass production.
A teleconverter (sometimes called tele extender) is a secondary lens mounted between a camera and a photographic lens which enlarges the central part of an image obtained by the lens. For example, a 2× teleconverter for a 35 mm camera enlarges the central 12×18 mm part of an image to the size of 24×36 mm in the standard 35 mm film format .
Canon U.S.A. Announces the Availability of the Versatile EF 200‐400mm F/4L IS USM Extender 1.4x Super-Telephoto Zoom Lens Award-Winning Photographer Shares First-Hand Experiences with the EF 200 ...
Unfortunately, with the lack of anything to prevent it, it also sucks in any airborne dust [2] This lens is compatible with the Canon Extender EF teleconverters on newer EOS bodies. Autofocus works with the 1.4× Extender (and only with cameras that can autofocus at f/8) and image stabilization (IS) works with both 1.4× and 2× Extenders.
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.
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