Shallow Focus
What is Shallow Focus?
Shallow focus keeps your subject sharp and crisp while blurring everything in front and behind it, drawing the viewer's eye directly to what matters.
At a glance
- Also known as
- Shallow depth of fieldSelective focusNarrow DOF
- Used for
- Isolating subjectsPortraiture and dialogue scenesCreating cinematic bokehDirecting viewer attention
- Common tools
- Fast prime lensesLarge-sensor camerasMidjourneyStable diffusionRunwayAdobe firefly
- Related terms
- Depth of fieldBokehRack focusApertureFocal lengthSoft focusDeep focus
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How it compares
Shallow focus intentionally restricts the zone of sharpness to isolate a subject, blurring foreground and background elements. Deep focus, as pioneered cinematographically by Gregg Toland in films like Citizen Kane, renders the entire scene from foreground to background in sharp detail simultaneously, allowing the viewer to survey the full spatial reality of the scene and the relationships between elements at different distances.
Think of it like…
Shallow focus is like using a spotlight in a darkened theatre: only the actor standing in the beam is fully visible, whilst everything else fades into the surrounding dimness. The spotlight doesn't show you less of the theatre; it tells you exactly where to look and what matters right now.
Pro tip
When prompting AI models for shallow focus, specifying the lens type and aperture (e.g., '85mm f/1.4 portrait lens, creamy bokeh') tends to produce more optically convincing results than simply asking for 'blurred background', as the model can draw on learned optical characteristics associated with specific lens types.
Types and variations
- Shallow focus varies in degree from moderately reduced depth of field (where background is mildly soft) to extremely shallow focus (where only millimetres of depth are sharp, as in macro or ultra-fast-lens portraiture).
- The effect can be applied to separate subject from background (the most common use), subject from foreground, or to isolate a single plane within a scene containing multiple depth layers.
- Shallow focus is distinct from soft focus: shallow focus is a precise optical effect, whilst soft focus applies diffusion across the entire image including the focal plane.
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Try MorphicCommon use cases
- Shallow focus is ubiquitous in narrative cinema, particularly in close-up and medium close-up coverage of characters during emotionally significant moments.
- It is the default aesthetic for high-end portraiture photography, food and product photography, and commercial videography.
- In AI generation, it is one of the most requested stylistic parameters for character portraits, concept art subjects, product renders, and cinematic still imagery.
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FAQs
Shallow focus is produced by any combination of wide aperture (low f-number such as f/1.4 or f/1.8), longer focal length lenses, close camera-to-subject distance, or large sensor size. Each of these factors reduces the depth of field ( the range of distances that appear acceptably sharp ) creating the characteristic subject isolation and background blur.
Shallow focus is a precise optical technique that keeps a specific plane sharp whilst blurring elements at other depths: it is a depth-of-field effect. Soft focus applies a uniform diffusion or blur across the entire image, including the focal plane itself, creating a dreamy, gauzy quality across all elements regardless of distance from the camera.
Bokeh is the aesthetic quality of the out-of-focus areas produced by shallow focus: specifically the appearance of blurred light sources, textures, and background elements. The character of bokeh varies between lenses based on the shape and number of aperture blades, and is considered an important qualitative attribute of fast portrait lenses.
Modern smartphones simulate shallow focus using computational photography: depth-sensing algorithms and AI processing create an artificial background blur (Portrait Mode) by separating subject from background using depth maps. The results are increasingly convincing but can exhibit edge artefacts where depth estimation is imprecise, unlike the smooth optical blur of a fast prime lens.
Shallow focus is typically chosen when the goal is to isolate a subject emotionally or narratively, remove distracting background information, or create an intimate, immersive feeling. Deep focus is preferred when the spatial relationships between characters and their environment are dramatically important, or when the filmmaker wants the audience to survey the full scene rather than have their attention directed.
AI video models trained on large datasets of real-world footage have learned the visual characteristics of shallow depth of field and can reproduce it when prompted with appropriate language or style cues. Some platforms also use depth estimation models to apply synthetic defocus, allowing users to define a focal plane and control the degree of blur applied to elements at different distances.
