eli5 how the background is in focus in videos, but blurry in photos with wide aperture
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To keep the background in focus in a photo you make the aperture smaller but this requires a slower shutter speed. How is this done when filming and the shutter speed needs to stay fast?
If you’re filming at 25 frames per second, you don’t need a particularly fast shutter speed. That sort of time scale would be regarded as a fairly slow shutter setting on a camera.
By adding neutral density filters or lighting at lower levels you can force the iris open reducing the depth of field. Most video cameras have nd filters built in. You can also dial in electronic shutters to reduce the available light also requiring the iris to open. This can add other complications. In film cameras you are stuck with ND filters.
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