4 vs 8 camera, rear-view and blind spot detection

[MP3Mike]

tbh I'm assuming that's just marketing spin designed to drive upsell of the full autonomy option.

No reason to believe they will actually choose not to use the data from the 4 side cameras in order to give the best implementation of autopilot features like blind spot detect - that would just be making their developers' jobs unncessarily harder.

Every car that supports enhanced AP is going to have 8 cameras, so why not use the 8 feeds if it makes the implementation easier?

Probably because it will gracefully degrade functionality if cameras get blocked/fail. So if all cameras except the main forward camera fail then you get degraded to the Classic AP functionality.

 

[MP3Mike]

What's not mentioned is which 4 are in Enhanced Autopilot. I'm assuming that these 4 are the 3 front facing, and the rear-view which is now used for Enhanced Autopilot.

So the email about upgrading from AP Convenience Features to Enhanced AP had additional information:

So now we know which 4 cameras are used by EAP:

• The main forward looking camera
• The two rear-facing side cameras
• One of the remaining forward looking cameras. (We don't know if it is the wide angle or long range camera.)

 

[Saghost]

Elon spelled it out in the Q&A audio, too. Since they emphasized the redundant front cameras, I'm thinking it is probably the standard and the long camera - the wide angle is very different from the other two.