What does EF stand for?

Equivalent Focal Length

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

Science, medicine, engineering, etc.

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Samples in periodicals archive:

With an equivalent focal length of 29-320mm, the lens offers an 11x zoom range, giving you less need to carry around multiple lenses.

United Kingdom: Canon introduces the EF-S 18-200mm f/3.5-5.6 IS lens

Lens: A good quality telephoto lens with a focal length of 210mm or a zoom lens with an equivalent focal length is recommended.

How to photograph hummingbirds

6x conversion factor inherent in the APS-C sized sensor, the high zoom ratio of this EF-S 55-250mm lens actually achieves the equivalent focal length of 88-400mm (in 35mm format).

Canon U.S.A.'s New EOS Rebel XSi Places Superior Optics and ...

The SD500 Digital ELPH also features a retractable 3x optical/4x digital zoom lens with a 35mm equivalent focal length of up to 37-111 mm, making it ideally suitable for a wide range of photographic applications from landscapes and snapshots to portraits and macro at a working distance of under four inches from the subject.

Simply Spectacular: Canon Tops the Digital ELPH Line with the New 7.1 ...

The equivalent focal length in a 35mm SLR camera is 37mm to 824mm.

Canon Rolls Out Three New 8MM Camcorders - Just In Time To Capture ...