Why can a camera only focus on one distance at a time, and what occurs inside to change that focal distance? Does the same principle apply to our eyes?

Question

Why can a camera only focus on one distance at a time, and what occurs inside to change that focal distance? Does the same principle apply to our eyes?

In: Physics

Answer 1

Actually, a [Light Field Camera](https://en.wikipedia.org/wiki/Light-field_camera) can focus on multiple distances at once. But most cameras can’t do this, nor can your eyes.