It's amazing how many coaches, fans, and players thanks that contact on the follow through affects the shot. Are there physics at work here that I don't understand?
If the shot has been released, contact on the shooter is not going to affect that shot. A proper follow through is the result of proper shooting techniques. But if the follow through is stopped, it certainly doesn't affect the shot.
I do agree with Bob and mick that a slap, whack, or hard contact should be called a foul.
Now, if there's contact on the hand while the shooter is still touching the ball, by a defender who is trying to block the shot, that contact is not accidental and I have a foul.