Term
Lens blow
Cleaning a lens or optical surface with approved air before using a suitable brush or cloth when needed.
In practice
Use only tools and methods approved for the optical surface; canned propellant, moisture, and abrasive debris can damage coatings. A crude historical nickname sometimes heard for this task should not be used as a professional instruction.
Usage note
The vulgar alias is included only for lookup and is dated, exclusionary workplace language.
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Sources
- Hollywood Slang: selections from Movie Speak — Vocabulary.com
- Glossary of Motion Picture Terms — Kodak