The Q and SL have autofocus and optical stabilisation. Based on Leica’s iconic film rangefinder series, it features an optical rangefinder instead of an electronic viewfinder and also lacks autofocus. Being a specific niche product, it is also very expensive (around $7000 body only). In 2015, Leica also produced two modern mirrorless cameras with an EVF: one premium compact (the Q), and the professional SL model. Leica has been producing digital full-frame mirrorless cameras since 2009. The M9 was the first digital full-frame rangefinder mirrorless camera with an interchangeable mount, and since then, they’ve released six more M models. Although the product lacks a mirror, it is different from what we would consider a modern mirrorless camera. So, which companies have actually produced mirrorless full-frame cameras as of 2015? At the time of writing, only two have seriously jumped on the bandwagon – Leica and Sony. This is easy enough to achieve with smaller sensors like APS-C or Four Thirds but becomes much more challenging with full-frame, especially if you want to introduce modern features such as autofocus and optical stabilisation into the lenses.

The problem for manufacturers that want to produce mirrorless full-frame cameras is that the word mirrorless has become synonymous with compactness and portability. This can be attributed not to the physical impossibility of fitting a mirrorless body with a full-frame sensor but the difficulty of achieving an optimum balance between body size and image quality. Full-frame cameras are commonplace on the DSLR market, with models available from Nikon, Canon, Sony and soon Pentax, but they have yet to permeate the mirrorless market to the same degree.

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