The original Q series featured a smaller 1/2.3 inch 12.4 megapixel CMOS sensor. The Fujifilm X-Pro1, announced in January 2012, was the first non-rangefinder mirrorless with a built-in optical viewfinder.Its hybrid viewfinder overlays electronic information, including shifting framelines to compensate for parallax.However, even more useful and common are today mirrorless cameras with a non-interchangeable zoom lens, whereas the big category is likely to become mirrorless system cameras with interchangeable lenses.
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Because of advances made in digital image sensor technology and electronic viewfinders, electronics are replacing most of the mechanics that once were necessary in film SLRs for framing an image through either an optical rangefinder or an optical viewfinder based on the single lens reflex mirror concept.
It is likely that this evolution will continue offering even smaller and more capable mirrorless cameras in the future.
One of the pioneers in the field has been Sony Corporation who supplies a large number of other camera manufacturers with image sensors.
Sony also sells cameras of their own, especially to show off advancements in their sensor and processing technology, often releasing improved designs at a rapid rate while simultaneously carefully limiting how they can and want to compete with their sensor customers.
The initial challenge was to provide an EVF with the resolution, clarity and response of direct optical viewing.
The second challenge has been that the contrast detect autofocus (CDAF) initially used in mirrorless cameras requires about twice the time to acquire focus compared to that of phase detect autofocus (PDAF).
The latest generation mirrorless cameras, however, have PDAF pixels built into the image sensor offering fully competitive and accurate autofocus and many times faster continuous shooting with continuous autofocus than DSLRs.
Mirrorless system cameras with smaller, high resolution sensors can here offer the advantage of the same final image coverage using shorter focal length, lighter lenses because of the so-called "crop factor" of the smaller sensor.
The Samsung NX10 (announced January 2010) was the first camera in this class not using the Micro Four Thirds system – rather a new, proprietary lens mount (Samsung NX-mount).