crown lens: meaning, definition, pronunciation and examples
Very LowTechnical / Specialized
Quick answer
What does “crown lens” mean?
A specific optical lens design consisting of a convex crown glass element paired with a concave flint glass element, used to correct chromatic aberration.
Audio
Pronunciation
Definition
Meaning and Definition
A specific optical lens design consisting of a convex crown glass element paired with a concave flint glass element, used to correct chromatic aberration.
Any achromatic doublet lens using crown glass, or more broadly, lenses made from crown glass characterized by low dispersion. In some contexts, 'crown lens' can refer to the entire achromatic doublet assembly.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. The technical terminology is consistent globally.
Connotations
Purely technical and neutral.
Frequency
Identically low frequency in both technical communities.
Grammar
How to Use “crown lens” in a Sentence
The [optical instrument] incorporates a crown lens.The [achromatic doublet] consists of a crown lens and a flint lens.To correct [aberration], one uses a crown lens.Vocabulary
Collocations
Examples
Examples of “crown lens” in a Sentence
verb
British English
- The design was crown-lensed to perfection.
- We need to crown-lens this telescope objective.
American English
- The objective is crown-lensed for better color correction.
- They crown-lensed the prototype to test the theory.
adverb
British English
- The elements were fitted crown-lens-wise.
- It was designed more crown-lens than flint-lens.
American English
- The system performs crown-lens efficiently.
- The light was bent crown-lens fashion.
adjective
British English
- The crown-lens design is over a century old.
- We examined the crown-lens configuration.
American English
- The crown-lens assembly was meticulously aligned.
- A crown-lens solution was proposed.
Usage
Meaning in Context
Business
Would only appear in the context of purchasing, manufacturing, or specifying optical components.
Academic
Used in physics, optical engineering, and astronomy papers discussing lens design and aberration correction.
Everyday
Almost never used; the average speaker would say 'camera lens' or 'glasses lens'.
Technical
The primary domain. Refers precisely to a lens made from crown glass or the crown glass component of a compound lens system.
Vocabulary
Synonyms of “crown lens”
Strong
Neutral
Weak
Vocabulary
Antonyms of “crown lens”
Watch out
Common Mistakes When Using “crown lens”
- Using 'crown lens' to refer to any high-quality lens.
- Thinking 'crown' refers to the shape (like a crown) rather than the type of glass.
- Pronouncing 'lens' as /liːnz/.
FAQ
Frequently Asked Questions
No, it is almost always used in combination with a flint glass lens to form an achromatic doublet, correcting colour distortion.
No, it refers to 'crown glass', a specific type of optical glass with low dispersion (low ability to separate light into colours). The name's historical origin relates to glassmaking techniques.
Primarily in technical literature related to optics, telescope making, high-end photography lens design, and microscope manufacturing.
Technically, smartphone lenses are complex multi-element assemblies that may use crown-type glasses, but the specific term 'crown lens' would not be used in everyday description.
A specific optical lens design consisting of a convex crown glass element paired with a concave flint glass element, used to correct chromatic aberration.
Crown lens is usually technical / specialized in register.
Crown lens: in British English it is pronounced /kraʊn lenz/, and in American English it is pronounced /kraʊn lɛnz/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Think of a royal CROWN made of clear, colourless glass. A CROWN LENS is the clear, low-dispersion 'king' of glass elements used to fix colour fringes in lenses.
Conceptual Metaphor
A TEAM OF SPECIALISTS: The crown lens (low-dispersion specialist) works with the flint lens (high-dispersion specialist) in a team (doublet) to solve the problem of chromatic aberration.
Practice
Quiz
What is the primary function of the crown lens in an achromatic doublet?