Aperture in Photography — Meaning, Chart, and Camera Examples

What aperture means on a camera

Aperture is the size of the lens opening during exposure. A wider opening lets in more light and creates shallower depth of field. A narrower opening lets in less light and keeps more of the scene sharp.

Camera aperture is written as an f-number: f/1.8, f/2.8, f/5.6, f/8, f/11, and so on. The confusing part is that smaller f-numbers mean larger openings. So f/2.8 is wider than f/5.6, and f/5.6 is wider than f/11.

Aperture chart for beginners

f/1.4 to f/2 lets in a lot of light and creates very shallow depth of field. Use this range for low light, strong background blur, and portraits where only the eyes need to be critically sharp.

f/2.8 is a popular balance for portraits, events, and zoom lenses. It gives strong subject separation while keeping a little more margin for focus errors than f/1.4 or f/1.8.

f/4 to f/5.6 is a practical everyday range for portraits with two people, travel, product details, and general photography. It gives noticeably more depth of field without forcing very slow shutter speeds in decent light.

f/8 to f/11 is the classic landscape and architecture range. It keeps foreground, middle ground, and background sharper when paired with careful focusing.

f/16 to f/22 creates very deep depth of field but can reduce sharpness through diffraction. Use it only when you truly need maximum depth of field or a sunstar effect.

How aperture affects exposure

Each full aperture stop doubles or halves the light entering the lens. Moving from f/4 to f/2.8 adds one stop of light. Moving from f/4 to f/5.6 removes one stop of light.

Because aperture is part of the exposure triangle, changing aperture usually requires a shutter speed or ISO adjustment. If you close from f/2.8 to f/5.6, you have removed two stops of light, so you may need a shutter speed four times slower or an ISO four times higher to keep the same brightness.

How aperture affects depth of field

Depth of field is the zone that looks acceptably sharp. Wide apertures such as f/1.8 create shallow depth of field and stronger background blur. Narrow apertures such as f/8 create deeper depth of field.

Aperture is not the only control. Longer focal lengths, closer subject distance, and larger sensors also make depth of field shallower. This is why an 85mm portrait at f/2 can look blurrier than a 24mm image at the same aperture.

Which aperture should you use?

For single-subject portraits, start around f/1.8 to f/2.8 when you want a blurred background. For groups, start around f/4 to f/5.6 so more faces stay sharp.

For landscapes, start around f/8 and adjust from there. For product photos on a tripod, f/5.6 to f/11 is often a safer range because sharpness and repeatability matter more than background blur.

For low light without flash, open the aperture as wide as your lens allows, then watch focus carefully. A very wide aperture helps exposure but makes missed focus more visible.

Common aperture mistakes

The most common mistake is using the widest aperture simply because the lens allows it. f/1.4 can look beautiful, but it can also leave one eye sharp and the other soft if the face is angled.

Another mistake is closing too far for landscapes. Many lenses are sharpest around f/5.6 to f/11. At f/16 and f/22, diffraction can make the whole image softer even though depth of field is deeper.