The mirrorless interchangeable-lens camera (MILC) is a class of digital system cameras. This type of camera provides an interchangeable lens mount. They do not have a mirror reflex optical viewfinder. MILC cameras comprise 5% of total camera shipments.After a few years without a well-defined classification, many specialized pages and also major manufacturers are adopting the term DSLM or simply Mirrorless. This standardization in the classification of this group of cameras has been a growing need, since DSLM or Mirrorless has been incorrectly included in the category Digital Compact Cameras. Compact cameras have tiny sensors and do not exchange lenses. Being compact is a quality of DSLM and one of its strongest attributes, which has attracted a growing number of adherents to the system. The DSLM has been manufactured with complete various sensor sizes from 1/2.3", 1/1.7", 1", Micro 4/3, APS-C and Full Frame sensors. And after 2013 DSLR downturn, in early 2014 many camera manufacturers, including Nikon released many MILC including the lenses.Various alternative names exist including: compact system camera (CSC), mirrorless system camera (MSC), digital single lens mirrorless (DSLM), digital interchangeable-lens system camera, and electronic viewfinder with interchangeable lens (EVIL)As of 2014[update], several MILC camera systems were available. In chronological order (by their introduction) and referring to the adopted lens-mount type, they are: Epson R-D1 using Leica M mount in 2004; Leica itself in 2006; Micro Four Thirds mount for Olympus and Panasonic MILCs; Samsung NX-mount for Samsung MILCs; Sony E-mount for Sony MILCs; Nikon 1-mount for Nikon MILCs; Pentax Q mount for Pentax small-sensor MILC (Pentax Q); K-mount for both Pentax DSLRs and Pentax large-sensor MILC; X-mount for Fujifilm MILCs; and Canon EF-M mount for Canon MILCs. (Sony's full-frame MILCs, introduced in late 2013, use the same E-mount as the company's APS-C MILCs, but require "FE" lenses for full-frame coverage.)