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A diffusion filter is a translucent photographic filter used for a special effect. When used in front of the camera lens, a diffusion filter softens subjects and generates a dreamy haze.
Please check details of diffusion filters at the manufacturer site.
Lee
(Diffusion List / Comparator / Diffusion Index)
http://www.leefilters.com/lighting/diffusion-list.html
Rosco (Cinegel)
(DIFFUSION MATERIAL IN FILM & VIDEO APPLICATIONS)
https://us.rosco.com/en/diffusion-material-film-video-applications
(Filter Facts)
https://us.rosco.com/sites/default/files/content/resource/2016-09/FilterFacts09.pdf
※ It is possible to search the desired filter more easily from the search box on the top of this website.