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DOF Calculator can be used to calculate the Depth of Field, Hyperfocal distance, Field of View, Angle of View and Magnification of a photograph.
A depth of field calculator can help photographers to figure out how much of their picture will be in focus. Depth of Field is a measure of how far in front or behind the focus point an object can be and still be in focus in an image. Depth of Field is determined by camera sensor size, lens focal length, lens aperture and subject distance.
If the focus distance is set to the hyperfocal distance, the image will have the largest depth of field possible for that sensor, focal length and aperture.
For example a landscape photographer may want to have the entire scene in focus, so they would choose to focus at the hyperfocal distance so that everything from the close foreground to the distant horizon would appear sharp in the final image.
On the other hand a portrait photographer may want to use a very shallow depth of field so that distracting elements in the background will be blurred out of focus and not detract attention from the subject of the portrait.
To calculate the DOF for a particular group of camera settings:

- Select the type of camera sensor you are using or scroll farther down the list to select your camera or scroll even farther down to choose a Circle of Confusion value.
- Select the focal length of the lens you are using.
- Select the aperture you are using.
- Select the focus distance units (Feet, Meters, etc) you would like to use.
- Type in the focus distance.

To calculate the DOF when focused to the hyperfocal distance, select the items above and then tap the Hyperfocal button to set the focus distance to the hyperfocal distance.
The results in the bottom half of the screen are constantly updated as you make changes. You will need to scroll down to see all the results.
DOF Calculator also displays the Field of View of an image. This lets you figure out how much will fit in a picture. For example if you take a picture with a Full Frame 35mm camera with a 50mm lens 10 feet from a wall, your image will show a 6ft 11.6in wide part of the wall and 4ft 7.7in high part of the wall.
Similarly, DOF Calculator also calculates the Angle of View of a image. The Angle of View is fairly constant with focus distance but changes slightly as you focus closer, especially when you get down to macro distances.
Farther down in the results list, Magnification is displayed. Magnification is displayed as a ratio of the size of the image on the sensor to its size in real life.
At the bottom of the results list, the actual sensor size and Circle of Confusion used in the calculations is displayed.
The sensor selector has choices for sensor sizes, DSLR cameras, and Circle of Confusion (CoC). You can make a selection from any of the groups. Don't worry if what you selected is not what shows up after your selection. The selector shows the first entry that uses the same values as what you selected. For example, if you select "Canon 7D, 50D" from the DSLR cameras section, when the selector closes you will see "1.6x DSLR" selected. This happens because the Canon 7D and 50D use a 1.6x sensor. If you reopen the selector you will see that every choice that uses a 1.6x sensor is checked. Not all 1.6x sensors are exactly the same size. Sometimes they vary by a few tenths of a millimeter. Only the sensors with the same size will be checked.