noun
also diffusing 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
noun
also diffusing 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
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012