3:2 or 4:3 — which to pick?

**3:2** (35 mm heritage) is more elongated, ideal for cinematic landscape, reportage, and full-page portrait. It flatters horizontal compositions and delivers that immediate *film-photo* feel. **4:3**, stockier, is native to Micro Four Thirds, the Fuji GFX medium format and most smartphones. It works better for tight portraits, still lifes and balanced vertical compositions. Practical rule: if your camera is native 3:2, stay there and crop later. If you shoot smartphone or MFT, 4:3 is your ally.

Is the 1:1 square ratio still useful in 2026?

Absolutely — but for the right reasons, not Instagram nostalgia. **1:1 remains an excellent compositional discipline exercise**: it forces you to center the subject, strip the superfluous, and think symmetry. It's also the favorite format of e-commerce product photography, avatars, music covers and certain conceptual art galleries. That said, it has lost its monopoly on Instagram with the rise of vertical **4:5**, which takes up more of the feed. Use the square as an *editorial choice*, not a default.

Is 9:16 mandatory for Reels?

Yes, if you want to maximize impact. **Full-screen 9:16** is the native format of Reels, TikTok and Shorts — it occupies 100% of the mobile screen and grabs the eye with no black bars or gaps. A 1:1 or 4:5 video on Reels leaves dull gray margins and hurts retention. For a still photo shared as a Reel or Story, same logic: think vertical, full-frame. Tip: shoot wide (16:9 or 4:3) then crop to 9:16 — that way you keep a horizontal version for YouTube or a website without going back into the field.

Framing

Aspect Ratio

The aspect ratio is the secret signature of your image — a frame that dictates the rhythm of reading before the eye even lands on it.

Photo : Alexander Andrews / Unsplash

Definition

What is an aspect ratio?

The aspect ratio is the relationship between the width and the height of an image, expressed as a proportion (3:2, 4:3, 1:1...). It's not just a question of dimensions: each ratio imposes a different reading rhythm, a visual grammar of its own.

The most common formats each carry a heritage. 3:2 comes from the 24×36 popularized by Oskar Barnack at Leica in 1925 — still the standard for full-frame DSLRs and mirrorless. 4:3 rules Micro Four Thirds and most smartphones, stockier, more grounded. 1:1 square is the DNA of the Hasselblad 6×6 — and became Instagram's standard in its early days. 16:9 dominates television, cinema and cinematic landscape. 4:5 has become the king of social-media portrait (Instagram allows it vertically). 9:16 owns Reels and TikTok. And for panorama lovers, the Hasselblad XPan's 65:24 remains mythical.

Choosing a ratio is already composing.

Example

In practice

Picture three concrete situations, three ratios, three stories.

Cinematic 16:9 landscape. You're shooting a mountain ridge at sunrise. Your camera's native 3:2 works, but 16:9 stretches the horizon, presses sky and ground against the golden line, and produces that Cinemascope feel you find in Villeneuve or Malick. The rule of thirds is still your ally, but reading turns horizontal, panoramic, contemplative.

4:5 Instagram portrait. You're photographing a friend full-length. Vertical 4:5 gains 30% more visible surface than 1:1 in the feed, which means 30% more attention. It's currently the maximum vertical format the platform allows. Frame wide at capture (in 3:2 or 4:3) and leave yourself margins for the crop in post.

Vivian Maier-style 1:1 street. With her Rolleiflex 6×6, Vivian Maier didn't choose the square — it was the only option. And that's exactly its strength: the square forces center-driven composition, kills the temptation of lazy landscape framing, and gives street scenes a documentary gravity. Try it to discipline your eye.

Common mistakes

What we see too often

Three habits keep coming back, and they're expensive in post.

Shooting JPEG 1:1 directly in-camera. A classic temptation for Instagram fans: set the body to square to nail the framing. Except you lose the margins irreversibly. With no RAW and a square JPEG baked in, there's no way to pull a 4:5 or a 3:2 later. Golden rule: always shoot in the sensor's native ratio (3:2 or 4:3), then crop.

Defaulting to 16:9 without intent. Panorama is sexy — but it doesn't suit everything. A horizontal 16:9 portrait chops off head or feet. A still life in 16:9 loses its density. 16:9 is a narrative choice, not an aesthetic reflex.

Forgetting that each platform has its preferred ratio. A horizontal 3:2 in an Instagram feed is ridiculously small. A 9:16 on LinkedIn looks out of place. A 1:1 on YouTube leaves two huge black bars. Match the ratio to the destination, or build several versions of the same frame. Thinking multi-ratio at capture is three hours saved in post.

How Focalis evaluates

How Focalis evaluates aspect ratio

Focalis-X automatically detects your image's ratio and weighs it against subject and intent. A horizontal 16:9 portrait gets flagged if the subject would have benefited from breathing in 4:5. A landscape squashed in 1:1 gets a panoramic crop suggestion. Focalis-X also offers platform-optimized crops (Instagram feed, Reels, TikTok, LinkedIn) with a preview of the recropped composition. The goal: turn a single capture into several coherent deliverables without amputating your intent. Analyze a photo →

FAQ

Frequently asked questions

3:2 or 4:3 — which to pick?
3:2 (35 mm heritage) is more elongated, ideal for cinematic landscape, reportage, and full-page portrait. It flatters horizontal compositions and delivers that immediate film-photo feel. 4:3, stockier, is native to Micro Four Thirds, the Fuji GFX medium format and most smartphones. It works better for tight portraits, still lifes and balanced vertical compositions. Practical rule: if your camera is native 3:2, stay there and crop later. If you shoot smartphone or MFT, 4:3 is your ally.
Is the 1:1 square ratio still useful in 2026?
Absolutely — but for the right reasons, not Instagram nostalgia. 1:1 remains an excellent compositional discipline exercise: it forces you to center the subject, strip the superfluous, and think symmetry. It's also the favorite format of e-commerce product photography, avatars, music covers and certain conceptual art galleries. That said, it has lost its monopoly on Instagram with the rise of vertical 4:5, which takes up more of the feed. Use the square as an editorial choice, not a default.
Is 9:16 mandatory for Reels?
Yes, if you want to maximize impact. Full-screen 9:16 is the native format of Reels, TikTok and Shorts — it occupies 100% of the mobile screen and grabs the eye with no black bars or gaps. A 1:1 or 4:5 video on Reels leaves dull gray margins and hurts retention. For a still photo shared as a Reel or Story, same logic: think vertical, full-frame. Tip: shoot wide (16:9 or 4:3) then crop to 9:16 — that way you keep a horizontal version for YouTube or a website without going back into the field.