鏡きょう筒とう

noun

lens barrel; lens tube

Refers to the cylindrical housing that holds lenses in optical devices such as telescopes, microscopes, and cameras.

• 望ぼう遠えん鏡きょうの鏡きょう筒とうをのぞいて星ほしを観かん察さつした。

  I observed the stars by looking through the telescope's lens tube.

• このカメラの鏡きょう筒とうは金きん属ぞく製せいでとても頑がん丈じょうだ。

  This camera's lens barrel is made of metal and is very sturdy.