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Usage of the Calculator

This Depth-Of-Field calculator works by dragging the object or the camera
 and filling in the five values in the upper left corner fields.
(Use decimal points, not comma's)

When the camera is dragged from left to right the aperture of the camera changes.

The Frame

By pressing the button "frame" the frame is kept constant in size, while the focal length
changes when dragging object or camera. Pressing the button again resets the state to a
variable frame

Aperture Scale

Use the "1/3" button to change the interval of the stops to 1/2 stops or back again.

Use the "log" button to change to a linear scale of aperture or back to logarithmic

The Circle of Confusion

The CoC, the "circle of confusion", is set by selecting a camera type in the menu.
You can override this CoC by typing another value in the textfield.
The film or chipsize remains coupled to the selected camera.

Display of the Camera

When the menu item "Scaled Camera" is chosen under the "Options" menu,
the back of the camera can be used as the position of the film plane. A drawing of
a view camera is used of which the bellowsdraw corresponds to the focal length and the image distance.

When the camera is not scaled, it can be more easily seen at a long distance scale,
but the back of the camera is no longer the film plane.

Equivalent Focal Lengths

When the button "frame" is pressed and another camera type is selected, equivalent focal lengths
can be found and the effect of film format on depth of focus inspected.

Effect of Printsize

When the menu item "Limitation by Printsize" is selected, the limit of resolution for the DOF
is calculated from the resolution of the human eye (0.02 degrees), the printsize and the
viewing distance of the print as given in the textfields.


By selecting "Macro Range" , the distance from film to object is used to select the longest image distance
so that magnifications of larger than 1x can be simulated.

Exposure Correction

The numerical dispayed "Exp.Cor." offers the increase in stops due to bellows extension.

Image Distance

The numerical dispayed "Im.Dist." offers the distance between film plane and plane of focus in the object space in millimeter.


The button "Settings:" allows switching of the options for scaling of object and camera, showing of DOF in the
view cone and limitations by printsize and diffraction for professional usage (indicated by "Prof"), or back
again to more relaxed usage (indicated by "Simple").

Circles of Confusion in the CameraType Presets

compact digicam
1.6x DSLR  0.02
35mm and full frame DSLR 0.03
4x5 0.15


The calculator uses formulae from optical theory, and are outlined in this pdf file