Wratten number

English

Etymology

Named after Frederick Wratten, British inventor who founded the first photography company.

Noun

Wratten number (plural Wratten numbers)

  1. Any of the arbitrary alphanumeric codes in a system for labelling optical filters, usually for photographic use.
This article is issued from Wiktionary. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.