ISO 14132-4:2015 applies to astronomical telescopes and gives terms and definitions for astronomical telescopes only.

The alphabetical indexes of terms that are common for all published parts of ISO 14132 are published in ISO 14132‑1.

The definitions can be changed, if required, by introducing derivative attributes into them, revealing the meanings of the terms used, showing the objects covered by the scope of the notion being defined. These changes will not to affect the scope and contents of this part of ISO 14132.