In photography or any optical system, the point at which an adjustable lens hones incoming light (or electron beams) to the smallest spot, generally producing the sharpest image. Focus also refers to the act of adjusting a lens to sharpen an image.
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In photography or any optical system, the point at which an adjustable lens hones incoming light (or electron beams) to the smallest spot, generally producing the sharpest image. Focus also refers to the act of adjusting a lens to sharpen an image.