Lens Field of View Comparison
Compare two focal lengths side by side and see how much of the scene each lens captures. Select your sensor size to account for crop factor, then explore the full reference table for every common focal length.
Field of View Reference Table
Diagonal field of view for common focal lengths at sensor size.
| Focal Length | Diagonal FoV | 35mm Equiv. | Category |
|---|---|---|---|
Understanding Field of View in Photography
Field of view (FoV) is how much of the scene your camera actually captures. It's the reason a 24mm lens and an 85mm lens give you completely different photos from the exact same spot.
Wide field of view? You get more of the scene. Narrow? You isolate a smaller slice. Simple as that.
How Focal Length Affects What You See
Focal length (measured in millimetres) is the distance between the optical centre of your lens and the sensor when focused at infinity. Short focal lengths like 14mm or 24mm give you a wide view, often exceeding 80 degrees diagonally. Long focal lengths like 200mm or 400mm narrow things down to just a few degrees.
That's why telephoto lenses are the go-to for wildlife and sports. You're seeing a tiny sliver of the world, magnified.
Here's the thing most people don't realise: the relationship between focal length and field of view isn't linear. Doubling your focal length doesn't just halve the angle. The maths involves an inverse tangent function, but the practical takeaway is more useful.
Going from 24mm to 50mm? That's roughly a 30-degree change. Going from 200mm to 400mm? Only about 3 degrees. You feel the biggest differences at the wide end.
Why Sensor Size Matters
Put the same 50mm lens on two different cameras and you can get two different fields of view. On a full frame camera, that 50mm gives you about 46.8 degrees diagonally. On an APS-C body with a 1.5x crop factor, it narrows to roughly 31.5 degrees.
That's the equivalent of a 75mm on full frame. The smaller sensor only captures the centre of the image circle, so it effectively crops in.
This is why you hear photographers talk about "35mm equivalent" focal lengths. It gives everyone a common reference point, regardless of sensor size. A 35mm lens on Micro Four Thirds (2x crop) behaves like a 70mm on full frame in terms of field of view.
Worth understanding before you buy a lens for your system.
Common Focal Lengths and Their Uses
Ultra-wide lenses (14-20mm) are brilliant for architecture, interiors, and dramatic landscapes where you want to exaggerate depth and pull in sweeping foregrounds.
Standard wide angles (24-35mm) are the workhorses. Street photography, environmental portraits, general-purpose shooting. If you're not sure what to bring, start here.
The 50mm is often called the "normal" lens because its field of view roughly matches what your eye perceives. It's a classic for a reason.
Short telephotos (85-135mm) are the portrait photographer's best friend. They compress facial features in a flattering way that wider lenses simply can't. Longer telephotos (200mm and above) excel at wildlife, sports, and any situation where you physically can't get closer to your subject.