ExpoImaging ExpoAperture - Manual (Page 37)

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4c. Exposure Compensation
The ExpoAperture Depth-of-Field Guide also has a very
handy reminder of exposure compensation for magnifica-
tion larger than 1/4th life size at the given ratios. The
compensation can be made either with aperture or shutter
speed adjustments.
Example: Given an image 1/2 as large as the subject, and
an ExpoAperture Guide indicated aperture setting of f8,
add 1 stop to get f11.