What Is an Aspect Ratio?
An aspect ratio is the shape of the picture - its width compared to its height, written like 2.39:1 (the image is 2.39 units wide for every 1 unit tall). It's a deliberate creative choice that shapes how a scene feels, not just a technical setting.
The Common Ratios
| Ratio | Name | Typical use |
|---|---|---|
| 1.33:1 | Academy / 4:3 | Classic & vintage films, some art-house |
| 1.85:1 | Flat widescreen | Dramas, comedies |
| 1.90:1 | IMAX digital | IMAX blockbusters |
| 2.39:1 | Scope / anamorphic | Epics, action - the cinematic 'wide' look |
| 1.43:1 | True IMAX | 15/70mm IMAX sequences |
Why Directors Care
Wider ratios (2.39:1) emphasise landscape, scale and the space between characters - perfect for epics. Taller ratios (1.43:1, 1.85:1) emphasise height and put more of the human figure and environment on screen at once. IMAX's tall frame is why its sequences feel so enveloping - see 1.43:1 vs 1.90:1.
🎬 Mixing ratios on purpose
Letterboxing and the Black Bars
Those black bars aren't lost picture - they preserve the film's true shape on a screen of a different ratio. A 2.39:1 film on a 1.90:1 IMAX screen shows bars top and bottom; an IMAX sequence then fills the whole height. How much you actually see depends on the screen and your seat - explore both in the screen size guide and the 3D simulator.