Assertion: digital camera's sensor | /r/HasProperty | located below the reflex mirror
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text: On-sensor autofocus is free of the adjustment requirements of the indirect focusing system of the DSLR (which relies on a separate autofocus sensor located below the reflex mirror), and the latest mirrorless cameras can shoot with phase-detect autofocus at up to 20 frames per second using up to 693 focus points—a number far exceeding what is available on any DSLR.