Overview
Depth of field (DOF) describes how much of your frame is in sharp focus. A shallow depth of field keeps only a narrow plane sharp — giving you the blurred background (bokeh) effect seen in cinematic interviews and portraits. A deep depth of field keeps everything from foreground to background sharp — used in documentary, landscape, and action sequences. Understanding what controls DOF lets you use it as a deliberate storytelling tool rather than a happy accident.
What You Need
- A camera with manual aperture control
- A lens with a wide maximum aperture (f/1.4–f/2.8 ideal for shallow DOF)
- Our Depth of Field Calculator to preview values before shooting
Steps
What depth of field is
A lens can only focus precisely on one distance — the focal plane. Objects in front of and behind that plane gradually become less sharp. Depth of field is the range of distances that appear acceptably sharp to the viewer — not a single line, but a zone. Within that zone, objects look focused. Outside it, they blur into bokeh. The size of that zone is what you're controlling when you talk about deep vs shallow DOF. A razor-thin zone means only your subject is sharp; a wide zone means foreground and background detail are both resolved.
The three controls: aperture, focal length, distance
Aperture is the most direct control. A wide aperture (low f-number: f/1.4, f/1.8, f/2.8) gives shallow DOF and strong bokeh. A narrow aperture (high f-number: f/8, f/11, f/16) gives deep DOF with everything sharp. Focal length also affects DOF: a telephoto lens (85mm, 135mm) compresses the scene and produces shallower DOF than a wide lens (24mm, 35mm) at the same aperture. Subject distance is the third factor: the closer you are to your subject, the shallower the DOF — and the further the background sits from your subject, the more blurred it becomes. To maximise bokeh: telephoto lens, wide aperture, close to subject, far background.
Shallow DOF vs deep DOF
Shallow DOF (f/1.4–f/2.8): isolates a subject from the background, draws the viewer's eye, creates intimacy and cinematic weight. Used in interviews, narrative close-ups, product shots. The risk: critical focus becomes difficult — a subject moving a few centimetres can slip out of the focal plane. Deep DOF (f/5.6–f/16): keeps everything sharp, provides context, feels documentary or observational. Used in wide establishing shots, action sequences, instructional content where background detail matters. Neither is inherently better — the choice should match what you're trying to communicate.
Using DOF creatively
A rack focus (pulling focus from one subject to another during a shot) uses DOF to shift the viewer's attention without cutting. Common in documentary and narrative: the foreground object is sharp at the start of the shot, then focus shifts to a subject in the background. A follow focus tracks a moving subject to keep them sharp as they move toward or away from camera — requires a follow focus mechanism or reliable autofocus. Foreground elements placed partially in the frame in soft focus — a plant, a doorframe, a shoulder — can add depth and frame a subject more cinematically. Shallow DOF makes this technique very effective.
Focus pulling basics
Manual focus pulling is the skill of turning the focus ring on a lens to move the focal plane smoothly during a shot. Practise on static subjects first: focus on near object, then slowly roll focus to a far object. The speed of the pull should match the pacing of the scene — a quick pull for dramatic effect, a slow pull for a gentle reveal. Mark your focus distances with focus marks (tape on the lens barrel or a proper focus mark ring) if you're pulling to specific known distances. On a gimbal or handheld rig, touch focus or eye-detect AF can be more practical than manual pulls — but for narrative work, manual control gives you intention.
Pro Tips
- Sensor size affects DOF: a full-frame sensor gives shallower DOF than an APS-C or Micro Four Thirds sensor at the same f-stop and field of view. This is why full-frame cameras are preferred for cinematic bokeh.
- Use our DOF Calculator before a shoot to preview exactly how much depth of field you'll have at any aperture, focal length, and distance combination.
- At very wide apertures (f/1.2–f/1.8), the DOF can be shallower than a person's nose-to-ear depth — making eye-level framing and locking off on a tripod critical for sharpness.
- If you can't achieve shallow DOF with your lens, move your subject further from the background. Background distance has as much impact on perceived bokeh as aperture.