Lens Flare

Narrative function

When a hard source sits near or inside the frame, the camera admits it cannot contain the light. Contrast falls.

A ghost of the iris repeats across the field. The sun, a hangar opening, or a bare practical becomes a force the glass is failing to image.

Use it when the observer is overwhelmed: encounter lights, headlights, a door onto daylight. The audience should feel the camera struggling to see, not a sticker riding the grade.

It is the wrong tool when no source can explain the artifact. If blocking the lamp does not change the flare, you have an overlay, not an optic.

How it works

Place a small, hard source (sun, HMI, bare bulb) just off axis or in frame. Uncoated or vintage glass scatters more.

A dirty or filtered front element veils the whole field. Spherical lenses print circular ghosts that take the iris shape when you stop down.

For composites, parent flare position and intensity to the source and cut it when something crosses the beam. Prompt the source, its angle to the glass, and whether the result is veiling, ghosts, or both.

When to use it

A rescue worker opens a hangar onto daylight. The frame whites and veils, then clears as her body blocks the sun.

Do not drop a rainbow streak on a night interior with no lamp in the lens.

Compared with similar shots

Anamorphic Flare is a horizontal streak from cylindrical anamorphic elements, not general scatter. Halation is a warm bloom on the emulsion around a highlight, not light bouncing inside the lens.

Light Leak is unfiltered light hitting film or sensor from a body gap, usually from the frame edge, not from a pictured source.

• Anamorphic FlareNight lights and headlights should write on the lens.
• HalationHighlights should bleed like film, not clip like video.
• Film GrainThe image should feel developed, not rendered.

In film

Close Encounters of the Third Kind lets encounter lights overwhelm the viewing system. Star Trek (2009) lets bright practicals streak and veil the frame.

Alien lets industrial sources dirty the glass. The Revenant lets the sun strike the lens as weather, not as a logo.

• Close Encounters of the Third Kind 1977Powerful encounter lights overwhelm the viewing system.
• Star Trek 2009Bright practical sources create conspicuous streaks and veiling light.

Prompt it

Name the source and the glass, not a pack. Example: Lens flare across [Subject], the sun or a hard practical striking the front element, veiling contrast, ghost orbs tracking the source, source-linked not floating.

A rescue worker opens a hangar door onto dazzling daylight. As the source enters the lens angle, a restrained flare and brief veiling glare wash across the image, then clear as she blocks it. Realistic source-linked behavior, no floating decorative rainbow effects.

What usually goes wrong

Wrong cousin: a grade overlay or an anamorphic streak pack with no lamp. Tell: the flare does not move or dim when the source is blocked, and it ignores occlusions.

Fix: put a real source in or near frame and parent the artifact to it.

Questions