The interview was less than expected, mostly due to the fact that the interviewer was Chinese and had a heavy accent. She asked more technical questions than expected, but they weren't too difficult if you learned the material recently.

If you are going to prepare, brush up on lens design, specifically the trade-offs that engineers usually face, like the trade-off between speed and aperture.

She did not ask any "soft" questions that allow you to add personality, but it seemed like that was just one person and not the usual.

Be ready for a good amount of "patting themselves on the back"; they seem to think very highly of Apple.

How would you improve the iPhone's camera?