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focal ratio

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.07 sec.
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Noun1.focal ratio - the ratio of the focal length to the diameter of a (camera) lens system
f number, stop number, speed
ratio - the relative magnitudes of two quantities (usually expressed as a quotient)


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The focal ratio is considered critical because it holds expenses down by reducing the height of the building needed to house the telescope.
MOLDING SUCCESSFUL MIRROR PROJECT : ARIZONA CAST TO FASHION 40,000 ... by Daily News (Los Angeles, CA)
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