A mirrorless interchangeable lens camera (MILC), frequently simply mirrorless camera, and sometimes also called EVIL (electronic viewfinder, interchangeable lens) features a single, removable lens and uses a digital display system rather than an optical viewfinder. The word “mirrorless” indicates that the camera does not have an optical mirror or an optical viewfinder like a conventional single-lens reflex camera (SLR), but an electronic viewfinder which displays what the camera image sensor sees.
Compared to DSLR cameras, mirrorless cameras are mechanically simpler and are typically smaller, lighter, and quieter due to the elimination of the moving mirror. While nearly all mirrorless cameras still have a mechanical shutter, many also have an electronic shutter, which completely eliminates any sound. Additionally the lack of a moving mirror reduces vibration that can result in blurred images from camera shake.
The first mirrorless camera commercially marketed was the Epson R-D1 (released in 2004), followed by the Leica M8. The Micro Four Thirds system, whose first camera was the Panasonic Lumix DMC-G1, was released in Japan in October 2008.