To give you an idea what the view of the court is like from section 312, here is a Youtube video shot from there during a Raptors/Washington Wizards game at the Air Canada Centre.
312 had a solid view of the court but I wouldn't sit here again simply because the upper level corners of any venue are less than desirable. So many other great alternatives in terms of seating. The rows are really small too, not much room in terms of seating on the upper levels.
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Here is a 2nd Youtube video shot from section 312 during a Raptors/Miami Heat game.
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