Focusing

From International Dictionary of Marine Aids to Navigation
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2-2-155

1. The operation of placing a point object at the focus of an optical apparatus.

2. The operation of placing a light source about or near the focus of an optical apparatus in such a way as to produce a desired light distribution.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM