It’s the sort of surprise that seems obvious once you see it, but isn’t so easy to predict. Without this experience, most people would guess that in a long expo

It’s the sort of surprise that seems obvious once you see it, but isn’t so easy to predict. Without this experience, most people would guess that in a long exposure picture of the night, you would see a black sky with perhaps brighter luminaries and more easily seen objects on the ground, not a blue sky.