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07. How do I correct for bellows factor?




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

07. How do I correct for bellows factor?

Ne = N*(1+M)

Bellows factor is the factor by which the effective f-number gets multiplied as the lens is focused up close. See the technical notes.

 

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previous page: 06. For a given lens and format what is angle of coverage?
  
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next page: 08. What is meant by circle of confusion?