How to Buy a Used Telescope

Somewhere near you there is a telescope that went outside three times. It was a good idea, then it was a shape under a sheet in the garage, and now it is a listing with a photo taken in bad light and the words “barely used.” That telescope is the best deal in amateur astronomy, because a telescope does not wear out. A mirror made in 2006 gathers exactly as much light as one made this year, and the sky has not changed. What has changed is the seller’s patience, and that is what you are buying.

The catch is that a used scope has no return policy and no box to tell you what should be in it. This is the ten-minute inspection I would do in the seller’s driveway, where the good listings live, what a fair price looks like against the new one, and the handful of models worth crossing town for. It also covers the thing that changed the used market in 2024: two of the biggest names in the hobby closed their doors, and their telescopes now live only second-hand.

Outer Space Trip may earn a commission from the new-price links on this page; your price is the same. How we choose. The classifieds sites linked here pay us nothing.

Why used is the best deal in astronomy

Three things make telescopes unusual among used goods. First, the part that matters, the optics, either works or it doesn’t, and you can tell which in daylight with a flashlight. There is no hidden mileage. Second, the hobby has a steep drop-out rate: the scope that shows Saturn on the first night and then waits for a second clear weekend that never comes is the most common telescope in the country, and it sells for a fraction of its price with everything still in the box. Third, the community that buys and sells this gear is small and unusually honest, because the same people meet at star parties.

Then there is 2024. On July 9 that year Orion Telescopes & Binoculars and Meade Instruments, which shared a parent company, closed their California offices and let their staff go the same day; Sky & Telescope reported it, and the brands’ assets went to auction that winter. Orion’s XT Dobsonians and StarBlast tabletops were, for twenty years, the scopes most beginners in America bought, and Meade’s LX200 and ETX lines sit in thousands of garages. Both are now used-market-only, which cuts two ways: there is a lot of good glass for sale, and there is nobody to call for a replacement part. I say this as someone who still uses one: the 10-inch Meade LX200 I bought after college is a 1990s design from a company that no longer exists, and it goes outside on clear nights the way it always has. The optics did not notice the bankruptcy. The electronics are another story, and we will come to them.

Where to buy a used telescope

In order of how much I trust what I will find there:

• Cloudy Nights classifieds. The biggest astronomy forum in English runs the biggest classifieds, and the sellers are the people who post in the forums under the same name. Listings are moderated, prices are close to what the gear actually fetches, and a seller who misdescribes a scope hears about it in public. Free account to read; you will need one to message.
• Astromart. Older, smaller, and skewed toward serious gear: big Dobsonians, premium refractors, mounts. A small membership fee keeps the casual sellers out, which is a feature.
• Your local club’s public night. Every club has a member upgrading, and a scope bought from someone who will show you how to use it under the sky is worth more than the same scope from a stranger. Find yours through NASA’s Night Sky Network club finder, or our state pages on free observatory nights (New Jersey, California, Texas and nine more).
• eBay. The most listings and the least knowledge. Good for a known model at a known price, and for the sold-listings filter, which is the only free public record of what used telescopes actually sell for. Insist on real photos of the optics, not the box, and use the buyer protection rather than a private deal.
• Facebook Marketplace and Craigslist. Where the garage scopes are, and where the bargains and the junk sit side by side. Meet in daylight, bring a flashlight, and do the inspection below before money changes hands.

What to check before you pay

Do this in daylight, in the driveway. Every item takes a minute, and a seller who will not let you do it has told you what you need to know.

Every telescope

• Point it at something far away and focus. A rooftop, a tree line, a distant sign. The image should snap to sharp and stay there. If the focuser drifts, grinds, or the image never gets crisp, walk away or price it as a project.
• Rock the mount. Grab the tube and give it a gentle push. It should settle in a second or two. A mount that keeps wobbling is the number-one reason beginners quit, used or new.
• Count what should be in the box. Finder scope and its bracket, at least one eyepiece, the diagonal on a refractor or catadioptric, the dust caps, the tripod or base. Missing pieces are fine if the price reflects them; a finder and two decent eyepieces cost real money to replace, and our eyepiece guide has the numbers.
• Ask why they are selling. “Upgraded” is the best answer in the hobby. “Never really figured it out” is the second best, because the scope is probably fine. “It fell” means look at the optics twice.

Reflectors and Dobsonians

• Shine a flashlight down the tube at the main mirror. You want a bright, even, silvery surface. Gray or chalky patches, a milky haze, or pinholes of light through the coating mean the aluminum coating is failing. A mirror can be re-coated, but it costs a meaningful fraction of the scope, so price it as a tube with a project inside, or pass.
• Look at the small secondary mirror near the top of the tube, held on thin vanes. Same test. Check the vanes are straight and tight.
• Find the collimation screws on the back of the mirror cell and confirm they turn. Collimation, aligning the mirrors, is a five-minute job you will do anyway; a seized screw is not.
• Dust is fine. A dusty mirror loses almost nothing. Do not let a seller’s cleaning attempt be the problem: scratches in arcs across the mirror mean someone wiped it, and that does more harm than a decade of dust.

Refractors

• Look through the front lens toward a bright sky with the caps off. Threads, spiderwebs or spots inside the glass are fungus, and a lens with fungus is a lens you cannot fix at home. A little haze on the outer surface cleans off.
• Check the lens edge for chips and the tube for dents near the front, where a drop lands.
• Long, skinny tubes on tall thin tripods with “525x” on the box were junk new and are junk used, at any price. The exception is a proper 80mm or larger refractor on a real mount; those hold their value for a reason.

Schmidt-Cassegrains and Maksutovs

• The front glass plate is the whole game. Look through it at an angle against a dark background: haze, fungus and internal fogging show up there first. A clean corrector on a Celestron C8 tube of any age is a lifetime optic.
• Turn the focus knob through its whole range. It should be smooth end to end. A stiff spot, or an image that jumps sideways as you focus, points to a mirror that shifts on its baffle, which is annoying rather than fatal on a visual scope.
• Look for corrosion on the tube and screws. These scopes get stored in damp garages, and rust on the fork arms or the visual back is a sign of what the inside saw.

Anything with motors

• Power it up and slew both axes before you pay. Bring the batteries or a power bank if the seller cannot. Motors that whine, stall, or move in one direction only are a repair, and on a discontinued mount, repairs mean the used market for parts.
• The hand controller must be present and working. A GoTo mount without its controller is a manual mount that weighs twice as much, and a replacement for a discontinued line can cost more than the scope. This is the single biggest trap in used Meade gear: the optics are excellent, and the 1990s electronics are the part that fails.
• Ask about firmware and the app on anything from the last decade. A Wi-Fi mount whose app no longer supports it has quietly lost its main feature.

What a used telescope should cost

There is no blue book. What there is, for the common mass-market scopes, is a current new price you can read in a minute, and a rule of thumb I use against it: a clean, recent scope with everything in the box is worth about half to two-thirds of what it costs new today. Take more off for missing accessories, a mount that needs work, or coatings that need attention, and expect to pay closer to new for anything that has been discontinued and is still sought after. Two kinds of gear hold value stubbornly: premium optics with a name on them, and Celestron’s C8 tube in any era. Two kinds lose it fast: old GoTo electronics, and anything from a brand that no longer exists to support it, which since 2024 includes Meade and Orion.

The new prices to hold in your head, all from our own guides and read this month: the Sky-Watcher Heritage 150 (~$340–360), the Celestron StarSense Explorer DX 130AZ (~$350–499), the Sky-Watcher Classic 8″ Dobsonian (~$700–750), and the Celestron NexStar 8SE (~$1,650–1,750). If a used listing for one of those is under half the new price and everything checks out, that is the deal this page exists for. If it is within 20% of new, buy new: you get the warranty, the return window and the box.

One more number to know: eBay’s sold-listings filter. Search the model, tick “Sold items,” and you have the last few months of real prices for that exact scope. It is the closest thing the hobby has to a price guide, and it is free.

Models worth buying used

These are the scopes I would drive across town for at the right price, and what to check on each.

What to walk away from

• The tall department-store refractor, at any price, even free. It will show you less than binoculars, and it is the scope that ends hobbies.
• A reflector with a failing mirror coating, unless it is priced as a tube and you have already looked up what re-coating costs.
• A GoTo mount with no hand controller from a discontinued line. Manual scopes are a joy; a dead computerized one is a very heavy manual scope.
• Any scope the seller will not let you look at in daylight. “It was fine last time I used it” is not an inspection.
• “Vintage” 60mm refractors priced as antiques. Lovely objects, and some of the older Japanese-made ones have good lenses, but that is a collecting hobby, not a stargazing one.

The first night with a used scope

Collimate it before you judge it: a Newtonian that has ridden in a car needs its mirrors aligned, and an out-of-alignment scope makes a good mirror look bad. Do not clean the optics unless they are dirty, and never wipe a mirror dry. Put the finder in line with the main tube on a distant rooftop before dark. Then point it at the Moon, and let the seller’s loss be your first clear night. Our stargazing for beginners guide has the first-week targets, and if the eyepieces that came in the box are the weak point (they usually are), the first-upgrade eyepiece is the best $50 you will spend on it.

The bottom line

Buy the optics, inspect the mount, and treat the electronics as a bonus that might not survive. An 8-inch Dobsonian or a C8 tube bought used from a club member is the best telescope purchase most people will ever make, and it is usually the cheapest. If nothing local turns up, the same money buys a lot new: our telescopes under $500 page is the new-price version of this list, and the beginner telescope guide goes up from there.