Depth of Field Calc

Store review

Ever taken a picture and wished that either more of it had been in focus or
the exact reverse and that less had been in focus? Of course you have I
certainly have. But what settings on your camera give which results and what
if you change one of those settings what is the Depth of Field then. You can
calculate it all yourself but it is not easy. This App takes all of those
problems and makes it easy to find the answers. Just type in the distance to
the subject, the focal length being used and the f-stop and the App calculates
the near and far distances of acceptable focus and therefore the depth of
field. This is all shown on an easy to understand diagram.

An example is: You are trying to take a photo of a bee on a flower and all but
the bee is to be out of focus. Set the distance of the subject to be 200 mm
(20 cm, approx 8 inches), set the f-stop to be f/5.6 and set the focal length
at 50 mm. The App calculates that the depth of field is 3.41 mm (0.3 cm, a
small fraction of an inch). The bee will be partially in focus but bees are
more than 3.4 mm across so that depth of field is probably not what you were
looking for. Set the camera to f/22 and now the depth of field is 13.39 mm
(1.39 cm or just over half an inch) now this is much closer to what you
wanted. Now maybe the whole of bee is in focus but still all of its
surroundings are out of focus.

This App will help you take much better photographs by being able to
understand the relationship between the settings on your camera and the depth
of field that they produce. The diagram shown is better than a thousand words
of text (as the saying goes). You can now easily see what effect a change in
the settings will make.

The Depth of Field Calculator allows you to quickly calculate the near and far
distances of acceptable focus. Just select the distance you are focused at,
the f/stop and the len's focal length and the diagram shows you at what
distance acceptable focus starts and at what distance it ends. You can select
to express the focus distance in metres, millimetres, feet and inches. Unlike
other Apps this App does not use picker wheels for the f/stop and focal length
values so you can enter whatever values you want.

The only other thing you have to do is select the camera you are using. The
Camera button takes you to a page with the makers of cameras listed to the
left. Select the maker of your camera and then scroll down the list to the
model. Select Save and you are now ready to calculate the correct values. The
calculations work using a value called the Circle of Confusion. This changes
depending on the camera make and model.

If you camera is not listed then email and it will be added. You can generally
find your Circle of Confusion value on the web. Once you know this value just
set it manually in field at the top and Save.

You can manually specify the Circle of Confusion to use. Just select the field
at the top and type in the value required. Select OK and then select Save. The
user-defined Circle of Confusion will be used.

Last update

Feb. 15, 2013

Depth of Field Calc

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