Distortions
Lens distortion cinematography warps space so straight lines bow, stretch, or melt: barrel, pincushion, mustache, extreme wide stretch, or a physical distorting optic such as a diopter, a bottle, or rain on glass. The lens is lying about geometry, not adding flare.
Narrative function
Walls lean. Faces balloon as they near the glass.
A hallway breathes. Space is not trustworthy.
The cause can be a very wide spherical, a fisheye, anamorphic mumps, heat shimmer, or a shot through a glass of water. Use it when the location should feel unsafe or subjective: a droogs' wide, a binge, a peephole, a fever.
Pick a distortion family and keep it consistent with the glass. It is the wrong tool for a clean normal-lens master, for flare without warp, or for a kaleidoscope of mirrors.
If color fringes without bent lines, that is chromatic aberration. If the whole mind is unhooked, consider altered state, of which distortion may be one part.
How it works
Choose the glass: 14 mm or fisheye for barrel, long glass for pincushion, anamorphic for mumps and wave, a close diopter for melt at the edge. Get too close to faces on a wide and perspective distortion adds to optical distortion.
Prompt: optical distortion around [Subject], stretched edges, melted geometry, named wide or fisheye, not a flare overlay.
When to use it
A close wide on a face in a tense interior, edges stretching, the room bowing, space untrustworthy. Do not keep a 50 mm rectilinear room and paste melted corners as a sticker.
Compared with similar shots
Fisheye is the extreme barrel member of this family, with a circular or strongly bowed field. Lens Flare is scatter, not geometry.
Chromatic Aberration fringes color on edges. 14mm Ultra-Wide distorts through field of view and proximity even when the designer corrects barrel.
Altered State may include distortion plus time and color.
In film
A Clockwork Orange uses extreme wides so rooms and faces are geometrically hostile. Fear and Loathing in Las Vegas melts space as intoxication.
Those are glass and proximity, not a warp filter parked on a normal lens.
Prompt it
Bend the space with glass. Example: Optical distortion around [Subject], stretched edges, barrel or melted geometry from ultra-wide or fisheye glass close to the face, the lens lying about space, not a flare pack.
What usually goes wrong
Wrong cousin: lens flare, fisheye circular crop without the scene, or altered-state color smear with straight walls. Tell: rainbow streaks, a round porthole sticker, or a clean rectilinear room with a melted overlay.
Fix: choose a lens family, bow lines, let near faces balloon, keep the warp attached to the optic.
Questions
What is lens distortion in film?
Geometric warping of space by the optic or by shooting through a distorting surface. Straight lines bow or stretch. The map of the room is no longer true.
Distortions vs fisheye
Fisheye is a specific extreme barrel lens. Distortions is the larger family: barrel, pincushion, anamorphic wave, heat, glass of water. Fisheye is one tool in that kit.
When should I use distortions?
When space should not be trustworthy. Do not use them on coverage that still has to be architecturally honest.
How do I prompt distortions for AI image or video?
Name the glass (ultra-wide, fisheye) or the surface, describe bowed lines and stretched edges, and forbid flare-only artifacts or a sticker warp.
Melies can generate this Distortions
Melies is the AI filmmaking workspace. This Distortions opens with the optical prompt loaded, so the effect has a physical cause in the frame.