The Canon FD-EOS adapter is rare and is only usable with certain FD telephoto lenses. Infinity focus would be lost with an adapter which lacks optical elements. Most of these lenses require autofocus and aperture motors inside the body which isn't available in EOS bodies. Lenses for the earlier Canon FD lens mount are not usable for general photography on an EF mount cameras, unless adapters with optical elements are used because they are made for a flange focal distance of only 42.0 mm. RF mount cameras can mount EF lenses with a variety of adapters.EF-M lens mount cameras can mount EF lenses with an EF-EOS M adapter.
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