The pack is primarily used to create spatial volume. Filmmakers use these overlays to introduce subtle haze, wispy smoke, or thick fog, which helps separate foreground subjects from backgrounds and adds a sense of "scale" to a shot.
You can find these assets as part of a subscription on the Lens Distortions website , which offers various membership tiers for freelance or commercial use. Fog, Rain & Dust 4K Video Effects
The modern iteration, Fog II 4K , is organized into four distinct categories to help editors find the right mood quickly: Slower , Faster , Textured , and Lower (designed to hug the bottom of the frame).
