1. What is the difference between a Full Frame Camera and a Crop Sensor?
Full frame camera have better image quality across the board, but they really shine when it comes to high ISO performance.
2. What are five advantages of the 6D compared to a T3i?
better noise performance, better color depth, much larger view finder, has a gps and shoots faster
3. What makes the autofocus of the Canon 5D Mark III better than that of the 6D?
the 5d has 61 point AF array with up to 41 cross-type AF sensors