The aperture is the hole in the camera lens that lets light through to the sensor (or film).

A bigger opening lets in more light, while a smaller opening keeps light out. Aperture is one of the three parts of the exposure triangle in photography.

It also controls the depth of field, texture, and overall look of an image.

What does aperture do in photography?

  • Exposure: A larger aperture (a smaller f-number, like f/2.8) lets in more light, making the picture brighter. If you use a smaller aperture (a bigger f-number, like f/16), the picture will be darker because it lets in less light. This is important when the light changes.
  • Depth of Field (DOF): The aperture has a big effect on how much of your scene is in focus.
  • Wide open (small f-number): shallow DOF; the subject stands out with a smooth blur in the background (bokeh).
  • Stopped down (large f-number): more of the scene from the front to the back is in focus.
  • Quality of the image and character: Lenses make edges, sharpness, and bokeh look different at different apertures. Some lenses are sharpest in the middle of their range, while others make a nice blur at wide apertures.

Ways to use aperture in a creative way

1) Portraits with a creamy background and a shallow depth of field

  • Use a wide aperture, like f/1.4 to f/2.8, to focus on your subject.
  • Position distance: move the subject away from the background to make the blur stronger.
  • Focus point: to make a strong connection, look at the eyes.

2) Environmental portraits and stories

  • A little bit stopped down (like f/4 to f/5.6) to keep both the subject and the setting in focus.
  • Add props and texture to the background to tell a story without losing the subject.

3) A landscape with a dramatic sky or foreground

  • For the sharpest image from the front to the back, use a small aperture (like f/8 to f/16).
  • A tripod will help keep the camera steady at slower shutter speeds.

4) Taking pictures of textures and macros

  • Moderate to small apertures (like f/8 to f/11) can help you get the most depth of field, which keeps textures in focus across a shallow subject area.
  • When you need both close-up and far-away things to be sharp, focus stacking can help.

5) Bokeh and shapes that are creative

  • Some lenses make bokeh that is unique. If you use special lenses or apertures, you can make backgrounds look like smooth, silky blobs or even strange shapes.
  • Backlighting can make the bokeh look more magical by bringing out the specular highlights.

6) Light diffraction and starbursts

  • A small aperture (like f/16 to f/22) around bright light sources can make starburst effects, which are great for night scenes or city lights.
  • Use a strong tripod and be aware that diffraction can make small details in images less clear at very small apertures.

7) Trade-offs between sharpness and softness

  • Try out your lens at different apertures to find the one that gives you the sharpest picture. Most lenses are sharpest between f/4 and f/8.
  • You can intentionally shoot wide open even though the center is softer to create a mood.

8) Consistency throughout a series

  • Use the same aperture throughout a series, like a portrait series or a street photography set, to keep the exposure and depth of field the same.

9) Hyperfocal photography

  • Use the hyperfocal distance to get the most depth of field in landscapes when you want both the foreground and background to be sharp enough.
  • You need to know your focal length and the DOF you want.
Small boat destroyed on the shoreline

Useful advice for using aperture

  • Find out how your lens works by testing its sharpness, bokeh, and aberrations at different apertures.
  • If the aperture you chose makes the whole picture too bright, use exposure compensation.
  • Think about how far away you are from your subject: DOF is less when you’re closer.
  • Use manual or semi-automatic modes (A/Av) to keep the aperture you want while the camera changes the shutter speed.

Aperture is more than just how bright a picture is; it’s a creative tool that affects mood, clarity, and storytelling.

You can make images that are purposeful and unique by trying out different openings, distances, and compositions.