system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do cameras need to focus? Why isn't everything equally crisp?

I'd understand if they had two lenses side by side, because they'd have to converge the light to the same point physics blah blah blah. But why do normal cameras, which don't have two lenses side by side, need to focus?
gpt
Because they still need to converge the light onto the sensor (or film if you're old school). It doesn't matter how many lenses there are, you always have to get the light to converge to get a clear image and that will happen at different settings depending on the distance of the object being photographed.