That diagram on the cover illustrates a graphical way to solve the lens
equation: one divided by the focal length equals one divided by the lens-to-film
distance plus one divided by the lens-to-subject distance. Any straight
line through the black dot (at the top right corner of the square) represents
a solution. The diagonal lines show how depth of focus and depth of field
are related to each other.

Continue with a description of what's in this
book and why.

Find out how to obtain this book..

Return to the Photo Books Table of Contents.