This standard specifies a total of 536 basic terms and definitions for cameras and photographic equipment, product names, component names, technical performance, photographic optics, and photosensitive materials. This standard is applicable to the formulation of instrumentation standards, the preparation of technical documents, the compilation of teaching materials and books, and the translation of documents, etc. Words in square brackets () in this standard are optional words; words in parentheses () are interchangeable words except for explanation.