adjective
describing a lens or optical system that has no focal point
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The camera lens used in astronomy is an afocal lens, which is designed to capture images without adjusting focus.
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I bought an afocal lens for my camera so I can take better pictures without having to adjust the focus all the time.
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I'm loving my new afocal lens - it's making my photos look so professional!
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Her mind was like an afocal lens, constantly capturing details without getting distracted by the bigger picture.