Get this calculator and more on your Smart Phone or Tablet in the Camera Calculators App
What is Depth of Field?
Depth of Field (DoF) is the distance at which an object will be perceived in focus. For example, using an 18mm focal length lens on an APS-C sensor camera such as the Canon EOS Rebel T5i with an aperture of 8 at a distance of 1 meter, you get a Depth of Field of 0.696m to 1.774m, meaning that if you focus your lens at 1 meter, any object within a distance of 0.696m to 1.774m from the camera sensor will be in focus.
What is the Hyperfocal Distance?
The hyperfocal distance is the distance at which you set the focus of a lens, and everything half that distance up to infinity will be in focus. For example, using an 18mm focal length lens on an APS-C sensor camera such as the Canon EOS Rebel T5i with an aperture of 8, you get a hyperfocal distance of 2.27 meters. Which means that if you set the lens to focus at 2.27 meters, anything from 1.13 meters all the way up to infinity will be in focus.
What is a Circle of Confusion (for advanced users)
When you view a point through a lens, the point will render out as a blur spot instead of a point. The Circle of Confusion is the size of the blur spot which our eyes cannot distinguish from a point. On this site we use the d/1500 calculation, which represents resolving 5 lines per millimeter on a print measuring 30 cm in diagonal. (If you are not sure, select the camera make and model you are using.)
To use this calculator, enter the following information:
- Focal Length of lens in milimeters. For an 18mm lens, write 18 regardless of the crop factor of your camera. The app will take care of the crop factor in the calculations.
- Aperture. For f/8, write 8.
- Distance from sensor of the camera to main subject.
- Select a unit of measure, either Feet, Inches, Meters or Centimeters.
- Select a Circle of Confusion. (If you are not sure, select the camera make and model you are using.)
- (Optional) Click this button to set the 3. Distance field to the Hyperfocal Distance. This allows you to use this calculator as an hyperfocal calculator.