optical crown glass
- noun
- Specialized
- The lens was made with optical crown glass to minimize chromatic aberration.
Examples
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Manufacturers often use optical crown glass in camera lenses due to its clarity and stability.
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The scientist used optical crown glass for the new telescope.
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Advancements in optical crown glass have improved the quality of scientific instruments.
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Many photographers prefer optical crown glasses for their lenses.
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Advancements in optical crown glass have improved the quality of scientific instruments.
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Manufacturers often use optical crown glass in camera lenses due to its clarity and stability.
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The lens was made with optical crown glass to minimize chromatic aberration.
Synonyms
1
6.0
A clear, strong glass that lens makers use for camera and telescope lenses
1
9.0
A type of glass lens makers use that bends light little and keeps colours from separating
A clear glass used in lenses that bends light only a little
How Dispersive
Surface Forms
Morphology
The words 'optical' and 'glass' make the overall idea — a kind of glass used in optical devices — immediately clear to a learner who knows those constituents, but the modifier 'crown' here is a technical subclass name (historical/manufacturing meaning) that is not predictable from the literal sense 'summit/top'. Because one constituent is essentially a specialized label rather than a transparent descriptor, the expression is only partially inferable.
Etymology
Optical crown glass combines optical (made for 'lenses') and crown glass, an old name for clear glass that glassmakers formed into a round 'crown' or bull's-eye shape when they blew it. Because that glass did not 'separate light into colours' much, it was chosen for good lenses, so optical crown glass now means high-quality glass used in camera and instrument lenses to keep images sharp.