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: A mechanism, such as a rack and pinion focuser , used to adjust the distance between the eyepiece and objective to sharpen the image. Astrophotography Equipment | Ultimate Beginners Guide

: The lens you look through, which magnifies the image formed by the objective. Most telescopes use interchangeable eyepieces with different focal lengths to vary magnification. astronomy telescope

An astronomical telescope's performance is primarily defined by two factors: and resolution , both of which depend on the size of the objective lens or mirror (aperture). : A mechanism, such as a rack and

: The foundation that supports the telescope and allows it to track the movement of the night sky. : A mechanism

: The main optical element that collects light. Larger apertures allow for the observation of fainter objects.