A look inside the Rebel T4i
The folks at Chipworks have torn apart a Canon EOS Rebel T4i/650D to take a look inside. There's some good explanation about phase detection autofocus as well as a list of the manufacturers used inside the camera.
About Phase Detection Autofocus
Phase detection is where there are pairs of sensors that are blocked left and right (or top and bottom) and from the differences, the camera has the information needed to bring the image into focus. Please remember that teardown articles are generally focused on preliminary analysis because that is all we have at the time of publication (our Technology Blog focuses more on hard facts about the chips). With that in mind, we can see that unlike the Aptina sensor Canon is using a somewhat irregular pixel pattern for phase detection versus Aptina that used a set of regular lines. Our full report will include key information like SEM and bevel analysis to show the implementation in more detail and at higher magnification.