This is an example of how the AF module of a Canon 5D looks in exploded view, which
is very similiar to the Canon 7D which we will look at in this context.The Seconday Image
Registration / Reformation (SIR)  lens module and the AF sensor will be our next step.


The AF Module
5D SIR and AF sensor
7D SIR and AF sensor
The AF sensor view
The SIR image shift