webOS Applications Support Site

DOF Calculator

DOF Calculator can be used to calculate the depth of field (DOF) in a photograph. It can also be used to calculate the Hyperfocal distance.

dofcalc_2009-23-09_212555

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
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 in sharp focus 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 use DOF Calculator to calculate the DOF for a particular group of camera settings:

Select the type of camera sensor you are using.
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 use DOF Calculator to calculate the DOF when focused to the hyperfocal distance:

Select the type of camera sensor you are using.
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.
Tap the Hyperfocal button to copy the hyperfocal distance to the distance field.

The results in the bottom half of the screen are constantly updated as you make changes.

Version History:

1.2.0 adds many new calculations (Field of View, Angle of View, & Magnification). It also displays the sensor width, height & CoC values used in the calculations. Field of View calculation results show how large of an area the picture will cover at the focus distance.
1.2.1 fixes a bug with the 2x DSLR
1.2.2 adds 43mm & 77mm lens choices
1.2.3 allows selecting focus distance greater than hyperfocal distance

Moon Exposure Calculator

Moon Exposure Calculator can be used to determine an approximate exposure to use as a starting point when taking pictures of the moon.

To use the calculator:

Select your desired aperture
Select the ISO speed
Select the approximate moon location
Select the weather conditions
Select the number of days until the next full moon. (This value is selected for you when you launch the app)

Your estimated shutter speed will be displayed each time you make a change.