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What is an equatorial mount?

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Although equatorial mounts come in an array of styles, they all work on exactly the same principle—one axis of the device is aligned to the celestial pole. Their mechanism unlocks to make large adjustments, then locks in place allowing the viewer to use slow motion controls to move in small increments of right ascension (RA) and declination (Dec). They often include devices called setting circles which allow the viewer to set the scope in the general area by using celestial coordinates. Some models even include a polar alignment scope allowing precise alignment.

This type of construction allows for use of a motorized drive unit which will track the celestial object as the Earth moves—an essential for those wishing to experiment with astrophotography.

At the other end of the mount is the counter balance—a weight that is at least equal to that of the telescope body and provides stabilization.

When choosing an equatorial mount, look for heavy construction and a minimum of plastic—especially on moving parts. This assembly then connects to the tripod, which should be of sufficient strength and durability to carry its load.

A large, heavy telescope on a flimsy mount is unacceptable. Lightweight aluminum tripods are fine for a small scope, but will fail soon on heavy ones. If the size of the counterbalance is larger or heavier than the mount—expect stripped gears and failed tripod legs. Don’t be afraid to bump a mount when shopping. A good one will stabilize in 2 seconds while looking through the eyepiece. It’s better to know before you buy than watch your telescope fall!

Although an equatorial mount might seem complicated at first, they are quite easy to learn and are the choice offered with most mid-to-large telescopes. Their styles might vary, but the principle will remain the same.

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