Gives the camera an aperture of finite size, so only one distance is in focus and everything else spreads. The cheapest model that produces depth of field at all.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Pinhole Cameraa pinhole holds everything in focus, unlike any real lens