Ask a room of amateur astronomers what matters most in a telescope and someone will say "the mount" before you finish the question. They are right. A great optical tube on a wobbly mount is a vibrating blur at 100x. A modest tube on a solid, smooth mount is a pleasure every night. Yet most first-time buyers spend all their attention on aperture and none on the thing holding it up.
There are really only two ways a mount can move: alt-azimuth (up-down, left-right) or equatorial (tilted to follow the sky's rotation). GoTo is a layer of motors and computers that can sit on top of either. Below I'll explain how each works, what it is good at, and how to match one to the way you actually want to observe. Specs come from Celestron and Sky-Watcher product pages.
The Short Answer
Choose an alt-azimuth mount (manual or GoTo) for easy visual observing, and an equatorial mount when you want long-exposure astrophotography, since it tracks the sky on one axis without field rotation.
- Alt-az: moves up-down and left-right; fastest to set up and the most intuitive, Dobsonians included.
- Equatorial: one axis points at the celestial pole; needs polar alignment and counterweights but tracks like the sky moves.
- GoTo: motors and a database find and track objects; available on both mount types.
- Rule of thumb: wedges and equatorial mounts matter once exposures pass roughly 30 to 60 seconds.
1. Alt-Azimuth Mounts: Point and Look
An alt-az mount has two axes: altitude (up and down) and azimuth (left and right). That's how a camera tripod or a cannon moves, so nobody needs a lesson to use one. Here's how the main mount families compare.
| Mount type | How it moves | Best at | Trade-offs | Examples |
|---|---|---|---|---|
| Manual alt-az (incl. Dobsonian) | Up-down and left-right, by hand | Fast setup, intuitive, visual observing | No tracking; you nudge to keep objects centered | Heritage 130, StarSense Explorer DX 102AZ |
| Alt-az GoTo | Same axes, motorized; computer tracks on both | Finding and tracking objects for visual use, short planetary video | Field rotation limits long exposures; needs power | NexStar 6SE, Virtuoso GTi 150P |
| Equatorial (German EQ) | One axis aligned with Earth's axis; tracking on one motor | Long-exposure astrophotography, smooth high-power tracking | Heavier, counterweights, needs polar alignment | Advanced VX |
| Dual-mode / wedge | Alt-az for visual, tilted to equatorial for imaging | One mount that does both | More setup decisions; wedge adds weight | AZ-EQ5, NexStar SE plus wedge |
Dobsonians are alt-az mounts too
A Dobsonian is just an alt-az mount built as a simple rocker box, and that's why it is the best value in astronomy: the money goes into aperture instead of mechanics. A tabletop Dob like the Heritage 130 sets up in a minute on a sturdy table. The trade-off is tracking. The sky drifts through the eyepiece, faster at higher power, and you nudge the tube to keep up. At 50x that's easy; at 200x you're nudging every few seconds.
Slow-motion controls and smooth bearings
On a manual alt-az, smoothness is everything. Look for motion with no stiction (that sticky jump when you start pushing) and no backlash when you let go. Some manual mounts add slow-motion knobs or cables so you can make fine adjustments without shoving the tube.
The limit: field rotation
An alt-az mount follows objects, but it doesn't account for Earth's rotation the way the sky turns around the pole. Celestron explains that on long exposures the field slowly rotates, so stars trail around the edges of deep-sky images. It doesn't matter for visual observing or short planetary video. It matters once you're stacking long exposures.
2. Equatorial Mounts: Built to Follow the Sky
An equatorial mount tilts one axis, the right ascension (RA) axis, so it points at the celestial pole and lines up with Earth's rotation. Once it's aligned, turning that one axis follows a star across the sky. Add a motor and the object stays put in the eyepiece or on the camera sensor with no field rotation.
Why imagers insist on one
Celestron's wedge guide suggests considering an equatorial setup once you're shooting exposures longer than about 30 to 60 seconds. That's where alt-az field rotation starts to show. A German equatorial mount (GEM) like the Advanced VX adds features aimed at imaging: Celestron lists a 30 lb (13.6 kg) instrument capacity, not counting counterweights, one 12 lb counterweight included, and permanently programmable periodic error correction to smooth out gear errors.
The cost: weight, balance and setup
A GEM uses a counterweight shaft to balance the tube, so the whole system is heavier than an alt-az mount for the same scope. It also flips the tube to the other side of the mount when tracking crosses the meridian. None of that is hard once you've done it, but it's more to learn on a first night, and the eyepiece ends up in awkward positions.
Polar alignment in practice
A rough visual polar alignment is good enough for visual use and short exposures. From the Atlanta area, latitude is about 34 degrees north.
- Level the tripod and point the mount's north leg or marker roughly north.
- Set the latitude scale to your latitude, about 34 degrees here.
- Balance the scope in both axes with the clutches loose.
- Aim the RA axis at Polaris using the altitude and azimuth adjusters, or a polar scope if the mount has one.
- Refine with the hand controller. The Advanced VX includes Celestron's All-Star Polar Alignment, which uses a bright star instead of requiring a view of Polaris.
3. GoTo: Motors, Databases and How to Choose
GoTo adds motors, encoders and a database to either mount type. After a short alignment, you pick an object and the mount slews to it and tracks. The NexStar 6SE is a classic example: a computerized alt-az single fork arm with a 40,000-object database. Its SkyAlign routine asks you to center any three bright objects; you don't need to know their names.
GoTo without a hand controller
Newer designs move the controls to your phone. Sky-Watcher's Virtuoso GTi 150P has built-in Wi-Fi and full GoTo through the free SynScan Pro app, and runs on 8 AA batteries or external 12V. Its Freedom Find dual encoders let you push the scope by hand without losing alignment. That's handy when you want to sweep the Milky Way and then GoTo the next target.
Dual-mode mounts and wedges
Can't decide? The Sky-Watcher AZ-EQ5 runs in German equatorial, alt-az or dual-scope mode, carries 30 lb, and has axis encoders so you can push it by hand without losing alignment. Fork-mounted SCTs like the NexStar SE can sit on an equatorial wedge, a precision tilting platform set to your latitude, which turns an alt-az GoTo into an equatorial one and removes field rotation. Celestron notes that larger wedge setups can take two people to install.
Matching the mount to how you'll observe
For visual observing with kids or a quick backyard session, an alt-az mount (Dob or GoTo) wins on setup time. If you want the computer to do the finding, alt-az GoTo is the easiest route. If astrophotography beyond the Moon and planets is the goal, buy an equatorial mount, and size it so your imaging payload sits well under the rated capacity. Celestron's own optical tube guide lists the scope designs that pair best with each use. In every case, a mount that's a size too big beats one that's a size too small.
Conclusion
If you remember one thing: alt-az for looking, equatorial for long-exposure imaging, and GoTo is an option on either. Most beginners are happiest with a solid alt-az mount, manual or GoTo, and graduate to an equatorial mount when the camera comes out. Whatever you choose, buy for stability first. A steady mount makes every eyepiece in the case better.
Want to feel the difference between a Dobsonian, a GoTo fork and an equatorial mount? Come by our Cumming showroom and we'll set them up side by side. You can also browse our mounts and tripods and telescopes, or contact us with questions.
Gear Mentioned in This Guide
Celestron Advanced VX Equatorial Mount
Computerized German equatorial with a 30 lb instrument capacity and periodic error correction.
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Sky-Watcher Virtuoso GTi 150P Tabletop GoTo Dobsonian
Alt-az GoTo controlled from your phone, and you can still push it by hand.
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Celestron NexStar 6SE Computerized Telescope
Single-arm alt-az GoTo with a 40,000-object database and SkyAlign.
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Sky-Watcher Heritage 130 Tabletop Dobsonian
The simplest alt-az mount there is: push the tube where you want to look.
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Celestron Equatorial Wedge for NexStar Evolution and SE 6/8
Tilts an alt-az fork to your latitude for longer exposures.
Shop nowFrequently Asked Questions
Which is better for beginners, alt-az or equatorial?
For most beginners, alt-az. It moves the way you'd expect, sets up quickly and needs no polar alignment. Equatorial mounts are worth the extra learning when you want long-exposure astrophotography.
Do I need an equatorial mount for astrophotography?
Not for the Moon, planets or short exposures. Celestron suggests considering a wedge or equatorial mount once exposures run longer than about 30 to 60 seconds, where alt-az field rotation starts to trail stars at the edges of the frame.
What is a GoTo telescope?
A GoTo telescope has a motorized mount with a computer database. After a short alignment, you select an object and the mount points to it and tracks it. GoTo can be built on either alt-az or equatorial mounts.
Is a Dobsonian an equatorial mount?
No. A Dobsonian is a simple alt-azimuth mount, a rocker box that moves up-down and left-right. Some Dobsonians, like the Sky-Watcher Virtuoso GTi, add GoTo motors.
What does polar alignment mean?
It means pointing an equatorial mount's right ascension axis at the celestial pole, near Polaris in the Northern Hemisphere, so turning that one axis follows the sky. You set the mount's latitude scale to your latitude, about 34 degrees in the Atlanta area, and fine-tune from there.
How much weight can a mount hold?
Check the rated payload and stay well under it, especially for imaging. For example, Celestron rates the Advanced VX at 30 lb of instrument load, not counting counterweights, and Sky-Watcher rates the AZ-EQ5 at 30 lb.
