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diffusion disk

noun
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variants: or less commonly diffusing disk

Definition of diffusion disk

: a piece of transparent material having special markings or embossings used with a photographic lens to give a soft focus or diffused effect to the image

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“Diffusion disk.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diffusion%20disk. Accessed 28 Oct. 2020.

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