Focal Length Guide: Which Lens for What, from 24mm to 100mm+

The most important feature that sets one lens apart from another is focal length — it determines what enters the frame and how much the background is compressed. In this guide we cover the five most common ranges and which type of shooting they suit.

24mm: wide angle, landscape and architecture

24mm is a practical starting point that offers a wide frame without creating extreme distortion — it provides a functional width for landscape and architecture while avoiding the exaggerated perspective distortion of ultra-wide lenses like 14–16mm. Used for portraits, though, it causes noticeable distortion in facial features, so it’s not preferred for close-up shots of people.

35mm: the standard of street and documentary photography

35mm offers a wide angle of view with a natural perspective; that’s why it’s the favourite focal length of many photographers, like photojournalists. In street photography, 35mm, 50mm and short telephotos in the 85–135mm range are used — each offering a different balance between preserving environmental context and isolating the subject. 35mm is ideal for photographers who want to tell the story without tearing the subject away from its surroundings.

50mm: the human eye’s perspective

The 50mm focal length mimics the perspective the human eye sees, which is why it’s one of the most-used focal lengths. A 50mm prime with an f/1.8 aperture can be found under $300 on most camera systems, offers superb image quality, and is the focal length closest to the human eye’s perspective — it’s usually recommended as the “first lens.” (If you’re undecided between 50mm and 35mm, our first prime lens article is exactly for this dilemma.)

85mm: the classic portrait choice

85mm is recommended as a starting point for portraits; longer focal lengths produce a shallower depth of field than shorter ones at the same aperture. 85mm holds its position as the most popular portrait lens thanks to a perspective that renders the face naturally and in balance, and its gentle compression of the background.

100mm and up: bringing distant subjects closer

Focal lengths of 100mm and up are ideal for zooming in on and isolating distant subjects like wildlife or sports. This range is also the standard focal length of macro lenses — a 100mm macro provides 1:1 magnification while keeping a safe distance from the subject.

Prime or zoom?

Prime lenses offer sharper images, wider apertures and a lighter body. Street and documentary photographers often prefer primes like 35mm or 50mm because of their compact size, natural perspective and the deliberate compositional approach a fixed focal length encourages.

Zoom lenses come into their own when the situation demands speed: at a wedding, you can move from a wide view of the venue to a close-up of the rings in seconds. A standard zoom in the 24–70mm or 28–75mm range covers most scenarios of portrait, travel, event and everyday photography without changing lenses.

Most professionals use both together: wedding and event photographers usually carry one or two zooms for flexibility, complemented by a fast 50mm or 85mm prime for dim reception shots.

Common mistakes

• Shooting close-up portraits with a wide-angle lens: distortion in facial features (the nose enlarges, the ears shrink).
• Getting stuck on a single focal length for every shot: as the environment and subject change, so does the right focal length.
• Thinking a zoom is always more practical: primes are usually lighter, sharper and wider in aperture — they make a difference especially in low light.