ExpoImaging ExpoAperture - Manual (Page 23)

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Example: Given a 35mm camera, 500mm focal
length, and a depth-of-field from 300’ to 375’.
Step 1 - Divide the actual focal length of the lens you are
using by 5 and set your Depth-of-Field Guide to the
resulting focal length.
500mm divided by 5 = 100mm. Set the focal length on the
Depth-of-Field Guide to 100mm.