A digital single-lens automatic camera is a digital camera that combines the eyes and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as controverted to photographic film. The reflex design scheme is the principal difference between a DSLR and other digital cameras. DSLRs typically use autofocus based on phase detection. This method allows the optimal lens position to be computed, rather than "found", as would be the case with autofocus based on dividing line maximization. autofocus is typically faster than other inactive techniques. As the phase sensor demands the same light going to the image sensor, it was previously only possible with an SLR design. However, with the introduction of the focal-plane phase detect autofocusing in mirrorless
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