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What does EF stand for?

EF stands for Equivalent Focal Length

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 36 other meanings of EF in our Acronym Attic

Samples in periodicals archive:

The DC240 has an ISO rating of 140 and is fitted with a lens giving an equivalent focal length of 39-117mm on a 35mm camera.