Sony kicked off a slew of Alpha camera launches today with its flagships, the A33 and A55. The two are the first to use translucent mirrors that let light hit both the autofocus and image sensors; the move allows the cameras to refocus even while the sensor is taking the previous shot. Using the mirrors not only improves the burst shooting speed, up to 10FPS for the A55, but makes the camera smaller as it doesn't have to have room for flipping the mirror.
