It's the same thing. Yes, not related to the movement of the camera, but I thought that would be easier to build your intuition about silver particles being deposited onto film. You make in batches, right?

The point is that just because things are random doesn't mean there aren't biases.

To get much more accurate, it helps to understand what randomness actually is. It is a measurement of uncertainty. A measurement of the unknown. This is even true for quantum processes that are truly random. That means we can't know. But just because we can't know doesn't mean it's completely unknown, right? We have different types of distributions and different parameters in those distributions. That's what we're trying to build intuition about