A star diagonal, erecting lens, or diagonal mirror is an angled mirror or prism used in telescopes that allows viewing from a direction that is perpendicular to the usual eyepiece axis. It allows more convenient and comfortable viewing when the telescope is pointed at or near the zenith (i.e.
A star diagonal, erecting lens, or diagonal mirror is an angled mirror or prism used in telescopes that allows viewing from a direction that is perpendicular to the usual eyepiece axis. It allows more convenient and comfortable viewing when the telescope is pointed at or near the zenith (i.e.
Source: Wikipedia "Star diagonal" · CC BY-SA 4.0
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