Description

This article is from the Photographic Lenses FAQ, by David Jacobson with numerous contributions by others.

05. What is the formula for magnification?

There are several forms.

        M = Si/So
        M = (Si-f)/f
        M = f/(So-f)

Continue to:

• prev: 04. What is the basic formula for the conditions under which an image is in focus?
• Index
• next: 06. For a given lens and format what is angle of coverage?