Iris

Background

A dynamic circular mask points to a detail and closes then opens the frame—not a lens zoom.

Narrative function

Iris shapes how audiences read space, time, power, or emotion. Used with intention, it becomes part of the film's visual grammar rather than decoration.

How it works

Execute Iris with clear marks: lock lens, distance, lighting, and timing so the technique supports the beat. Rehearse once, then protect continuity across coverage.

When to use

• When the scene's emotion or geography benefits from Iris.
• When you want a readable visual motif that can pay off later.
• When a contrasting setup will make the next cut or reveal land harder.

FAQ

What is Iris?

A cinematic technique: Iris — a deliberate visual choice with readable grammar on screen.

When should I use Iris?

When the scene's emotion or geography benefits from Iris.

What is a common mistake with Iris?

Using Iris as a flex without story motivation.

Prompt

Includes camera move matched to the title, plus lens triad extras: focal length, aperture/T-stop, ISO, shutter, white balance, and the story being filmed.

16:9 cinematic demo: Iris.
Technique: An animated aperture-shaped matte points to a detail, closes the first view and opens a second without changing lens focal length.
Scene: A locksmith closes shop, then begins work at a different bench the following morning.
Start: A: medium view with the locksmith's eye near the upper-right third and a key rack behind.
Motion: A 0–4: iris closes from 2–4 s around the eye; B 4–8: iris opens from 4–6 s around the key. The black aperture fully closes at the 4 s splice. Keep audio silence for a quarter-second around closure. Generate each labeled plate separately with the specified framing and extra edit handles; do not substitute a single unedited clip.
End: B final: the circular matte is fully open, and the hand has picked the new key off the bright workbench.
Camera: 50 mm rectilinear prime; fixed focal length within this plate, f/4, shutter 1/48s, ISO 400, 24fps.
Light: A broad 5600 K window at camera left supplies the key; a white floor returns weak fill. Keep the opposite wall dark and retain texture in pale surfaces. Lock exposure and white balance rather than letting the effect drive automatic corrections.
Color: Dark umber shop to pale brass workbench. Muted blue-grey shadows, warm-neutral midtones and ivory highlights; moderate saturation, gently lifted deepest blacks and a smooth highlight shoulder. Preserve differences between cloth, skin and hard surfaces instead of smoothing them into a single material.
Duration: 8s. Mode: multi_shot.

Related techniques

• Match Cut

  A match cut connects distinct shots through a visible correspondence that also carries an intelligible relationship.

• Jump Cut

  Removing intervals inside a similar camera setup creates a conspicuous time jump rather than a continuous speed change.

• Cross-Cutting

  Cross-cutting alternates continuing action lines to invite a relationship in time while preserving each location's geography.