Turn a clip into footage from a pinhole camera: a box with a hole instead of a lens. Nothing is in focus and nothing is far out of focus, the corners fall into darkness, and the blacks never quite reach black.
Softness everywhere
Every point in the scene projects as a small disc rather than a point, so the whole frame carries the same softness. Optical Softness sets the disc size as a percentage of the short edge. Values between 0.6% and 1.5% read as pinhole; above 3% the clip turns into shapes and light.
Falloff and image circle
Light reaching the corners travels further and strikes at a steeper angle, so illumination drops fast away from the center. Light Falloff sets the depth of that shading and Image Circle sets how far out it reaches full strength.
Grain and fade
Grain stands in for the noise of a long exposure and is redrawn on every frame, 30 times per second of source time. Shadow Fade lifts the black point the way flare inside a home-made box does. Subjects with strong light and clear shapes survive the softness best; small detail and text are the first to disappear.