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What does EFL stand for?

EFL stands for Effective Focal Length

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

  • Science, medicine, engineering, etc.

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We have 81 other meanings of EFL in our Acronym Attic

Samples in periodicals archive:

The interposition of an achromatic binocular objective lens at half the focal length produced a back focus of 160mm--the system now has a effective focal length of 336mm at F:3.
The 6x optical zoom lens offers an effective focal length of 35-210mm, there's an optical image stabilizer to help combat camera-shake, plus an optical viewfinder and flash hotshoe.
Digital sensors are currently smaller than the area of a 35mm image, so the effective focal lengths of lenses are increased by about 50% when attached to a digital camera.