ExpoImaging ExpoAperture2 Manual (Imperial/Standard) - Manual (Page 16)

ExpoAperture 2 Depth-of-Field Guide Manual
V 1.0
16
2.F - Determining Depth-of-Field for a Given Aperture and Focal Distance
Use this method to determine your depth-of-field when your camera is set to a specific
aperture and you know your focal distance.
EXAMPLE:
The photographer is using a digital SLR camera with a 1.5x crop factor, a 45mm lens
stopped down to f/11 and is focusing on a subject that is 7½ feet away. What is the
resulting depth-of-field given this photographer’s settings?
STEP 1 –
Set the Focal Length Dial to the correct format or desired circle-of-confusion that you wish
to use. In this example, the photographer is using a 1.5x or 20 microns circle-of-confusion.
STEP 2 –
Rotate the Focus Zone Dial of the guide to
expose the focal length of the lens you are using
through the small window labeled “FL – mm.”
Here, the photographer is using a 45mm focal
length.
STEP 3 –
Note the number of Focus Zones (2 zones)
under the aperture (f/stop) to which you have
your camera set, in this case f/11.
STEP 4 –
Turn the Guide over. On the Guide’s Distance Dial
find the focal point of your lens, in this case, 7½
feet.
STEP 5 –
Each alternating gray or white arc represents one
zone. From Step 3, you have 2 zones in focus, one
on either side of your 7 ½ foot focal zone. The
numbers above the sides of these 2 zones represents
the depth-of field the photographer will achieve, 6’
to 10’.
2.G - Determining Hyperfocal Distances
Hyperfocal distance is the distance setting that produces the greatest depth-of-field for any
given aperture. Knowing the hyperfocal distance of the particular camera/lens setup is
particularly useful in landscape photography where the photographer may want the
photograph in focus from the nearest possible distance to infinity. Using this method you
can determine the hyperfocal distance.