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equivalent focal length

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia 0.01 sec.
length, equivalent focal
In an optical system composed of more than one lens, it is the linear distance separating the principal focus from the corresponding principal point. It is usually the most important quantity in the specification of an optical system as in objectives, eyepieces, etc. See principal focus; equivalent power.


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Lens: A good quality telephoto lens with a focal length of 210mm or a zoom lens with an equivalent focal length is recommended.
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).
5in 230k LCD monitor, RAW mode shooting and a massive 18x Leica zoom lens with optical image stabilization and a 28-504mm equivalent focal length range.
 
 
 
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