|This is the discussion page for Autofocus.
types of active autofocus
I've been told on several occasions that some active-autofocus systems measure the time between emitting a light pulse and its return to the sensor. This violates no physical laws, but the precision required seems difficult to achieve in a modestly priced consumer product. Does anyone know for sure? William Sommerwerck 12:33, 26 January 2010 (EST)