Focal length, measured in millimeters, sets the angle of view of a lens. Short numbers show wide scenes, long numbers bring distant subjects closer. The chart below groups common ranges, using full-frame equivalents, so you can see what each is generally used for.
The Chart
| Range | Typical use | Strength | Limit |
|---|---|---|---|
| Ultra-wide (under 24mm) | Interiors, landscapes, architecture | Huge view, strong sense of depth | Stretches edges and distorts close faces |
| Wide (24 to 35mm) | Street, travel, environmental portraits | Context without extreme distortion | Subjects look small at distance |
| Normal (40 to 60mm) | Everyday, documentary, general portraits | Natural perspective | Neither very wide nor very tight |
| Short telephoto (70 to 135mm) | Portraits, details | Flattering compression, blurred backgrounds | Needs more room to work |
| Telephoto (150 to 300mm) | Sports, wildlife, stage events | Brings far action closer | Heavier, needs fast shutter speeds |
| Super-telephoto (400mm and up) | Birds, distant wildlife | Extreme reach | Large, often needs a support |
How to Read the Numbers
- On a smaller sensor, multiply the focal length by the maker’s crop factor to find the full-frame equivalent view.
- Wider lenses show more of the scene and exaggerate near objects.
- Longer lenses compress distance, making backgrounds look closer to the subject.
Shutter Speed Guidelines
A common rule of thumb is to use a shutter speed at least as fast as one over the focal length, such as one two-hundredth of a second at 200mm. Stabilization and steady technique can allow slower speeds, but moving subjects still need fast ones.
Matching Range to Subject
- Choose wide for scenes where surroundings matter.
- Choose normal when you want a view close to what the eye sees.
- Choose short telephoto for faces.
- Choose long telephoto when you cannot move nearer.
Keep in mind that the ranges overlap and that makers label zooms differently. A lens marked with a wide span may cover two or three rows of the chart. Look at the widest and longest numbers, and consider how often you would use the ends of the range.
Prime lenses, which have one fixed focal length, are often smaller and open to wider apertures. Zooms offer convenience. Many photographers carry one zoom for flexibility and one fast fixed lens for dim scenes, and the chart helps find where those two overlap and where a gap remains.
FAQ
Which focal length is best for a beginner?
A normal range around 35 to 50mm is simple to use, and a general zoom covering wide to short telephoto lets you explore many views.
Does focal length change depth of field?
Yes, at the same subject size and aperture, longer lenses give a shallower look to the background.
The Short Version
Use the chart to link subject to range: wide for context, normal for everyday scenes, short telephoto for people, long telephoto for distance. Your own habits will refine the choice.