Portrait depth of field guide
Portrait Depth of Field Calculator: Control Background Blur
Portrait photographers use shallow depth of field to isolate a subject. A calculator helps you avoid focusing so narrowly that the eyes, face or small movements fall outside the sharp range.
Fast answer: Use Simple DoF Calculator to compare f/1.4, f/2, f/2.8 and f/4 at your actual portrait distance before choosing the final look.
What changes portrait depth of field?
Wider apertures, longer focal lengths and closer focus distances usually create shallower depth of field. Sensor format and viewing assumptions also affect the calculation.
How to use the app for portraits
- Select your camera body.
- Enter the portrait lens focal length, such as 50 mm, 85 mm or 135 mm.
- Set the subject distance.
- Compare apertures and watch the total depth of field change.
- Choose the aperture that gives the blur you want while keeping the subject sharp.
Practical portrait tip
For close headshots, a very wide aperture can create a focus range thinner than expected. Calculate first, then decide whether stopping down slightly gives a better keeper rate.