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focusing scale

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focusing scale [′fō·kəs·iŋ ‚skāl]
(optics)
A graduated scale to indicate appropriate lens-to-image plane positions for given lens-to-object plane distances.


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The use of teleconverters does not affect the focusing scale for the close focusing distance as marked on the barrel of the prime lens, and the indicated magnification is always obtained.
Some lenses have a red dot or a line on the barrel of the lens along the focusing scale.
These pictures are close-ups of the focusing scales of three different lenses of 55, 75 and 200mm focal lengths.
 
 
 
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