Why is everything not just always in focus why do our eyes have to focus on certain things while making the forground and background unfocused?
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It’s a fact of light that the bigger the opening into which light comes in, the worse things can be in and out of focus. If you had a literal pin-hole camera with the “lens” just being an exceptionally tiny hole through which light comes into the film exposure area, everything would pretty much always be in focus. However the amount of light coming in would be very small and so you’d need to be very sensitive to light, or a camera might need a very long exposure time for its film.
Bigger openings let more light in, making designing the light sensor or film easier since it doesn’t need to be as sensitive. But focusing the light properly now becomes a problem.
TV and movie cameras are huge, great for capturing detail, but oh boy do they need to be focused properly….
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