What is 2.39:1 cinema scope? The widescreen film format explained

By TechCompare · Updated November 2026 · How we check

2.39:1 is the cinema scope shape, and 2048 × 858 is the registry's 2K container size. On a 16:9 screen, scope films show bars above and below.

Screen A: 16:9

Screen B: 239:100

Difference: 239:100 is 34.4% wider than 16:9

2.39:1 next to 16:9 at the same height, pre-loaded. Swap in another ratio to compare width differences side by side.

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2.39:1 is the widescreen cinema ratio, and the ISDCF (Inter-Society Digital Cinema Forum) projector registry labels the format Scope. A 55-inch panel in this shape measures 50.7 × 21.2 inches (128.9 × 53.9 cm). The registry's 2K container, 2048 × 858 pixels, comes close to this shape without matching it exactly.

Aspect ratio

2.39:1

55" diagonal

Dimensions

128.9 cm × 53.9 cm50.7" × 21.2"

55" at 2.39:1

How this is calculated

The ISDCF projector aspect ratio registry labels the format "Scope (2.39:1)." The page's body text says, "Occasionally product is packaged with Aspect Ratios other than 1.85 (Flat) or 2.39 (Scope)." As of November 2026, the registry lists 2K Scope at 2048 × 858 and 4K Scope at 4096 × 1716.

Divide 2048 by 858 and you get 2.387, which rounds to 2.39:1. The 4K container works out to 2.387:1.

Set a 16:9 frame beside a 2.39:1 frame at the same height, and the scope frame is 34% wider. On a 16:9 screen, a scope film fills the width and leaves bars above and below.

Verdict

A 2.39:1 panel only makes sense if most of your viewing is scope film and the bars bother you. A 55-inch panel in this shape measures 50.7 × 21.2 inches (128.9 × 53.9 cm). At the same height, it's 34% wider than 16:9, so the picture is wide and short. A 16:9 screen gives you more height for everything else.