This is the simplest type of telescope mount. It has only up/down
(altitude) and left/right (azimuth) motions. It is used primarily for
low to medium power Dobsonian telescopes and terrestrial spotting
scopes, as it cannot easily follow at high powers the seemingly curved
paths taken by celestial objects as they cross the sky. A telescope on
this type of mount generally cannot be used for astrophotography.