Depth of Field
Calculate DoF from aperture, focal length, and distance
How to use Depth of Field
- 1Set your camera to aperture-priority or manual mode and pick an f-number.
- 2Enter the focal length, aperture, and focus distance into the calculator.
- 3Read the near and far limits plus the total in-focus zone.
What Is Depth of Field?
DoF depends on f-number, focal length, focus distance, and circle of confusionDepth of field is the distance range in a photo that appears acceptably sharp. A wide aperture (small f-number) gives a shallow, blurred background; a narrow aperture keeps more in focus.
Photographers use it creatively for portraits (blurred backgrounds) and landscapes (everything sharp from front to back).
Frequently asked questions
What makes background blur stronger?
A wider aperture (lower f-number), a longer focal length, and a closer focus distance all increase background separation and blur.
Why does stopping down increase sharpness?
A smaller aperture (higher f-number) widens the acceptable focus range, bringing both near and far subjects into the sharp zone.
What is the circle of confusion?
It is the largest blur spot still perceived as a point. Smaller sensors need a tighter circle, which reduces the apparent depth of field.