"The Canon EOS M is the world's first serious mirrorless camera.

By "mirrorless" I mean modern digital cameras with DSLR image quality, live through-the-lens (TTL) viewing and interchangeable lenses, just without the flipping mirror. Obviously 4x5" cameras have no mirrors, but I'm not referring to them.

By "serious," I mean professional grade. Sony, Samsung, Fuji, Olympus, Panasonic and other third-tier brands offer lots of mirrorless cameras, but then aren't pro grade; they are just consumer electronics products and usually only with smaller 4/3 sensors (or smaller) and/or lens mounts often with few advanced lenses available. (First tier is LEICA, classic Hasselblad, Contax and others. Second tier is Nikon and Canon.)"

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Canon EOS M