Definition of variable-focus condenser

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Photonics Dictionary

variable-focus condenser

An Abbe condenser in which the upper lens element is fixed. The lower lens may focus the illumination between the elements so that it emerges from the fixed lens as a large-diameter parallel bundle. The field of low-power objectives thus may be filled without removing the top element. It also can be adjusted to have a numerical aperture up to 1.3.

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