How the hell can cameras capture a perfect still image of a scene?
In: Technology
There’s a mechanism in a camera that works like a curtain (called the shutter). Only this curtain can open and close extremely fast. Thousands of a second. That’s why the scene appears to be still. Behind the curtain there is typically a light sensitive film or digital light sensitive sensor that captures the scene for that very short period of time before the curtain closes again.
because the shutter speed is super fast. like 1/4000 of a second or faster. which means that unless something is moving ridiculously fast, it’s gonna get captured as if it’s standing still.
to put this in perspective. lets say that the camera frame is 20feet across and it captures the photo at 1/4000 of a second. so for the object to move 1 inch across this view in 1/4000 of a second means it has to move at 333 feet per second. which means it has to travel at 227 miles per hour for it to even show the slightest blurr in the picture. now if you make the frame wider than 20 feet or have a shutter speed faster than 1/4000 of a second. it’s gonna have to be traveling even faster.
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