Bokeh

What is Bokeh?

Bokeh is the soft, blurry quality of the background behind a sharp subject in a photo or video.

At a glance

Also known as
Background blurDepth of field blurLens blurOut-of-focus rendering
Used for
Subject isolationVisual depthPortrait aestheticsCinematic texture
Common tools
Wide-aperture lensesTelephoto lensesAI image generationPost-production blur effects
Related terms
Depth of fieldApertureShallow focusLensSubject isolation

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How it compares

How it compares

Bokehdepth of field

Depth of field describes the range of distance within a scene that appears acceptably sharp. Bokeh describes the visual quality and character of the out-of-focus areas beyond that range. Shallow depth of field produces more visible bokeh; deep depth of field keeps more of the scene sharp and reduces the visibility of bokeh. The two concepts are related but describe different aspects of the same optical phenomenon.

Think of it like…

Imagine taking a photo of a flower in a garden. If the flower is sharp and clear but everything behind it is a soft, gentle blur, that blur is bokeh. Some blurs look smooth and creamy like melted ice cream, and some look like lots of little circles. The type of blur depends on the camera lens being used, and photographers often choose lenses based on how pretty their blur looks, not just how sharp they are in the focused area. Viewers associate smooth, soft bokeh with professional photography and high production value, and its presence in an image consistently signals quality even to audiences who would not be able to name the technical effect they are responding to.

Pro tip

When prompting AI generation for bokeh effects, specify both the quality and the context. Soft circular bokeh background, shallow depth of field, 85mm portrait lens quality produces more accurate and aesthetically consistent results than simply bokeh or blurry background. Mentioning the type of subject and lens character gives the model more precise visual reference to draw on.

Types and variations

  • Circular bokeh comes from lenses with many rounded aperture blades and produces smooth disc shapes from point light sources.
  • Polygonal bokeh comes from lenses with fewer straight blades and produces hexagonal or pentagonal shapes.
  • Swirly bokeh is an optical characteristic of certain vintage lenses that creates a spiralling, turbulent pattern in the defocused areas.
  • Cat's eye bokeh produces elliptical shapes toward the edges of the frame due to optical vignetting.
  • Neutral bokeh is smooth and featureless, providing clean background separation without distinctive patterning.

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Common use cases

  • Portrait photography and videography uses wide-aperture lenses to produce background bokeh that isolates the subject cleanly.
  • Cinematography uses lens bokeh as part of the visual language that defines a production's look.
  • Food and product photography uses background bokeh to separate subjects from environmental context.
  • AI image generation uses bokeh descriptors to produce depth and visual richness in generated portraits and product imagery.
  • Social media content creators reference bokeh aesthetics in prompts to achieve professional-looking subject isolation.

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FAQs

What is bokeh in photography?
Bokeh is the aesthetic quality of the out-of-focus areas in a photograph or video, describing the visual character of background or foreground blur. It is shaped by lens optical design, aperture blade count, focal length, and the distance between subject and background.
How is bokeh created?
Bokeh is created by using a wide aperture and a lens with sufficient focal length to produce shallow depth of field. When the background falls outside the focus plane, the lens renders it as blur, and the character of that blur is the bokeh. Wide-aperture prime lenses on telephoto focal lengths produce the most pronounced bokeh.
What makes bokeh look good?
Smooth, circular, evenly sized blur discs from point light sources are widely considered the most aesthetically pleasing form of bokeh. This is produced by lenses with many rounded aperture blades. Harsh, geometric, or busy bokeh patterns are generally considered less desirable for portrait and subject photography.
What is the difference between bokeh and depth of field?
Depth of field describes the range of distance within a scene that appears acceptably sharp. Bokeh describes the visual character of the out-of-focus areas outside that range. Shallow depth of field produces more visible bokeh, but they describe related aspects of the same optical effect rather than the same thing.
What lenses produce the best bokeh?
Fast prime lenses with wide maximum apertures and many rounded aperture blades tend to produce the most highly regarded bokeh. Longer focal lengths compound the effect by providing greater background separation at typical subject distances.
How do I add bokeh in AI image generation?
Include specific bokeh descriptors in your prompt, such as shallow depth of field with soft circular bokeh, subject isolated against creamy blurred background, or 85mm portrait lens with bokeh. Specific optical descriptions produce more accurate depth separation than generic blur or blurry background.
Can bokeh be added in post-production?
Yes. Lens blur filters and AI-powered depth-of-field effects in editing software can simulate bokeh in post-production. However, optically produced bokeh from a real lens during capture has a more natural quality than simulated background blur, which can look artificial when applied to complex subjects or scenes.
Why do filmmakers care about bokeh?
Bokeh is part of the visual texture of a lens choice and contributes to the overall aesthetic look of a production. The character of background blur communicates visual quality, production value, and genre associations. It is one of several optical characteristics, alongside sharpness, contrast, and flare, that define how a lens renders a scene.
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