Leica was one of the early entrants in the mirrorless camera race (2006), as they simply transitioned their existing M-mount film camera to digital with the M8. The M series are a bit different than most later mirrorless cameras in that the M-mount Leicas use an optical rangefinder (manual focusing) and don't rely upon Live View on the rear LCD to compose (except the newest M type 240). Later variations of the M (9, M-E, Monochrom, 240) are full frame, while the original M8 is APS sensor size.

In 2014 Leica introduced a new mirrorless camera type based around an APS sensor, the T, which uses a new set of autofocus lenses (though it can use Leica M-mount lenses via an adapter). 

Here is the full set of mirrorless cameras Leica has produced, with complete data for each:

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