# Split Diopter — composition technique | AIM Previz

https://aimpreviz.com/learn/techniques/split-diopter

[Previz](https://aimpreviz.com/) / [Techniques](https://aimpreviz.com/learn/techniques) / Composition · Advanced

# Split Diopter

Split Diopter is a composition technique: Half the lens carries a close-up element, so a near face and a far face are both sharp with a visible seam between them. In PREVIZ picking it sets the lens in Keyframe, Director and Infinitum.

Published 29 Sep 2026Updated 4 Oct 2026by the PREVIZ team

What it does to the frame

Half the lens carries a close-up element, so a near face and a far face are both sharp with a visible seam between them.

- **Reads as** — Dramatic
- **Difficulty** — Advanced
- **Runs in** — Keyframe · Director · Infinitum

The control it moves in PREVIZ

- Lens Keyframe · Director

  Split Diopter

  Half-lens creating simultaneous sharp focus on two depth planes.

  circular bokeh · minimal flare · sharp

  Best for: Suspense, Brian De Palma style, Dual focus

Picking the technique sets these controls; it does not paste text into a prompt. The setting can be re-run, checked against the settings beside it, and carried into the next shot.

## Also in composition

What the glass does to the frame: how much of it is sharp, how wide it reads, what the edges do.

- **[Shallow Focus](https://aimpreviz.com/learn/techniques/shallow-focus)

Basic · Cinematic, Romantic** — Only a thin slice of the scene is sharp. Isolates the subject from its surroundings and is most of what makes an image read as 'cinematic'.
- **[Deep Focus](https://aimpreviz.com/learn/techniques/deep-focus)

Advanced · Dramatic, Documentary** — Everything from foreground to horizon is sharp. Lets action play out on several planes at once instead of directing the eye by focus.
- **[Anamorphic](https://aimpreviz.com/learn/techniques/anamorphic-wide)

Intermediate · Cinematic** — Squeezed capture that yields a very wide frame, oval bokeh and horizontal blue flares. The most recognisable 'big film' signature there is.
- **[Vintage Glass](https://aimpreviz.com/learn/techniques/vintage-glass)

Intermediate · Nostalgic, Romantic** — Older uncoated lenses: lower contrast, swirling backgrounds and flares that bloom easily. Imperfection used deliberately.
- **[Tilt-Shift](https://aimpreviz.com/learn/techniques/tilt-shift-miniature)

Advanced · Artistic** — The focus plane is tilted off perpendicular, leaving a narrow band sharp across the frame. On a wide view it makes real places look like models.

## Reads the same way

Other techniques that read as dramatic — a light or a lens to pair with this move.

- **[Low Angle](https://aimpreviz.com/learn/techniques/low-angle)

Basic · Dramatic, Cinematic** — The camera sits below the subject and looks up. Reach for it when someone should read as powerful, imposing, or in control of the room.
- **[High Angle](https://aimpreviz.com/learn/techniques/high-angle)

Basic · Dramatic** — The camera looks down on the subject. The inverse of a low angle — it diminishes, and is the standard way to make someone read as vulnerable.
- **[Steep Overhead](https://aimpreviz.com/learn/techniques/overhead-steep)

Intermediate · Dramatic, Artistic** — Steeply down but not fully vertical. Keeps faces readable while a true bird's eye loses them — the usual choice when you want the detachment but still need performance.
- **[Profile Shot](https://aimpreviz.com/learn/techniques/profile-shot)

Basic · Artistic, Dramatic** — Dead side-on, ninety degrees to the subject's facing. Reads as formal and observational — you are watching rather than being addressed.
- **[Behind the Subject](https://aimpreviz.com/learn/techniques/behind-subject)

Intermediate · Cinematic, Dramatic** — Directly behind, seeing what they see. Puts the viewer at the character's shoulder and makes the environment ahead the subject of the shot.
- **[Over-the-Shoulder](https://aimpreviz.com/learn/techniques/over-the-shoulder)

Basic · Cinematic, Dramatic** — From behind and to one side, with the near shoulder in frame. The workhorse of dialogue coverage — it fixes who is looking at whom.
- **[Extreme Close-Up](https://aimpreviz.com/learn/techniques/extreme-close-up)

Basic · Dramatic, Horror** — A detail filling the frame — eyes, hands, an object. Removes all context, which is exactly why it reads as intense or claustrophobic.
- **[Close-Up](https://aimpreviz.com/learn/techniques/close-up)

Basic · Dramatic, Cinematic** — Head and shoulders. The standard shot for performance — close enough that the face carries the scene.
- **[Dolly Zoom](https://aimpreviz.com/learn/techniques/dolly-zoom)

Advanced · Horror, Dramatic** — Track in while zooming out (or the reverse). The subject stays the same size while the background rushes — the standard visual for dread or realisation.
- **[Push In](https://aimpreviz.com/learn/techniques/push-in)

Basic · Dramatic, Cinematic** — The camera moves steadily toward the subject. The most reliable way to tell an audience that this moment matters.
- **[Rack Focus](https://aimpreviz.com/learn/techniques/rack-focus)

Advanced · Dramatic, Cinematic** — Focus shifts from one plane to another mid-shot. Redirects the viewer's attention without moving the camera or cutting.
- **[Dutch Angle](https://aimpreviz.com/learn/techniques/dutch-angle)

Basic · Horror, Dramatic** — The horizon is tilted. Signals that something is wrong — the most legible unease cue in the language.
- **[Snorricam](https://aimpreviz.com/learn/techniques/snorricam)

Advanced · Horror, Dramatic** — The camera is rigged to the actor, so they stay locked in frame while the world lurches behind them. Disorientation, or dissociation.
- **[Chiaroscuro](https://aimpreviz.com/learn/techniques/chiaroscuro)

Advanced · Dramatic, Artistic** — Extreme contrast between light and dark with very little in between. Borrowed from Baroque painting; the darkness does as much work as the light.
- **[Rembrandt Lighting](https://aimpreviz.com/learn/techniques/rembrandt-lighting)

Intermediate · Dramatic, Cinematic** — Key light high and to one side, leaving a small triangle of light on the shadowed cheek. The classical portrait setup.
- **[Split Lighting](https://aimpreviz.com/learn/techniques/split-lighting)

Intermediate · Dramatic, Horror** — The light comes from ninety degrees to the side, so half the face is lit and half is in shadow. Reads as division or duplicity.
- **[Rim Light](https://aimpreviz.com/learn/techniques/rim-light)

Basic · Cinematic, Dramatic** — Light from behind that traces a bright edge around the subject, separating them from the background. Almost every night exterior uses it.
- **[Silhouette](https://aimpreviz.com/learn/techniques/silhouette)

Intermediate · Artistic, Dramatic** — The subject is unlit against a bright background, reduced to outline. Identity withheld — shape carries the whole shot.
- **[Harsh Noon](https://aimpreviz.com/learn/techniques/harsh-noon)

Intermediate · Documentary, Dramatic** — Overhead midday sun. Short hard shadows and blown highlights — usually avoided, which is exactly why it reads as unglamorous and real.
- **[Bleach Bypass](https://aimpreviz.com/learn/techniques/bleach-bypass)

Advanced · Dramatic, Action** — Skipping the bleach step leaves silver in the print: contrast climbs, colour drains, grain hardens. Harsh and metallic.

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