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05. What is the formula for magnification?




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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)

 

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previous page: 04. What is the basic formula for the conditions under which an image is in focus?
  
page up: Photographic Lenses FAQ
  
next page: 06. For a given lens and format what is angle of coverage?