The reflector vs refractor telescope debate is one you’ll encounter within five minutes of researching your first scope. If you’ve spent any time on astronomy forums, you’ve probably noticed that everyone has a strong opinion about which is “best” — opinions that directly contradict each other.
Here’s the truth: none of them is objectively best. Each design does certain things well and involves certain trade-offs. The right choice depends on what you want to observe, how much you want to spend, and how much you’re willing to carry around. Let me walk you through it without the tribal warfare.
Refractor Telescopes
A refractor is what most people picture when they think “telescope” — a long tube with a lens at the front and an eyepiece at the back. Light enters through the objective lens, gets bent (refracted) to a focus point, and you look at the result.
What they’re good at: Refractors produce sharp, high-contrast images with no central obstruction. This makes them excellent for the Moon, planets, and double stars, where fine detail and contrast matter. They’re also essentially maintenance-free — no mirrors to align, no open tube collecting dust. Point and observe.
What they’re less good at: You get less aperture per pound compared to reflectors. A 90mm refractor might cost the same as a 130mm reflector, and that 40mm difference means noticeably less light-gathering ability. For faint deep-sky objects like galaxies and nebulae, aperture is everything, so refractors are at a disadvantage here.
Cheaper refractors also suffer from chromatic aberration — a purple or blue fringe around bright objects caused by the lens bending different wavelengths of light by slightly different amounts. Higher-quality “ED” (extra-low dispersion) or “APO” (apochromatic) refractors solve this problem, but they cost significantly more.
Best for: Beginners who want low maintenance, Moon and planetary observers, and people who value portability.
Reflector Telescopes (Newtonians)
A reflector uses a curved mirror at the bottom of the tube to gather and focus light. A smaller secondary mirror near the top redirects the light to an eyepiece on the side of the tube. The design was invented by Isaac Newton, which is why they’re often called Newtonians.
What they’re good at: More aperture per pound than any other design. A 150mm reflector costs roughly the same as a 90mm refractor, and that extra aperture makes an enormous difference. They also have no chromatic aberration — mirrors reflect all wavelengths equally, so there are no colour fringes. Excellent for deep-sky observing.
What they’re less good at: They need occasional collimation — aligning the mirrors to keep images sharp. It sounds daunting, but it’s genuinely a five-minute job once you’ve done it a couple of times. The open tube can also collect dust, though this affects image quality less than you’d expect. And the secondary mirror creates a small central obstruction that slightly reduces contrast compared to a refractor of the same aperture.
When mounted on a tripod, they typically come with equatorial mounts, which can be confusing for beginners. A reflector is only as good as its mount — if the mount wobbles, everything wobbles.
Best for: Anyone who wants maximum bang for their buck, deep-sky enthusiasts, and people who don’t mind a bit of occasional tinkering.
Dobsonian Telescopes
Here’s the thing that confuses people: a Dobsonian isn’t really a different type of telescope. It’s a Newtonian reflector on a specific kind of mount — a simple, swivelling alt-azimuth base sometimes called a “rocker box.” John Dobson invented the design in the 1960s to make large-aperture telescopes accessible to ordinary people, and it worked brilliantly.
What they’re good at: Everything reflectors are good at, plus the mount is intuitive and rock-solid. You push the tube to aim it and let go — no knobs, no alignment, no fuss. The simplicity of the mount also means the money goes into the optics rather than the engineering, so you get staggering aperture for the price. A 6-inch Dobsonian costs around £250–300. A 6-inch reflector on an equatorial mount costs more and is harder to use.
Dobsonians are the telescope I recommend most often for beginners. They deliver the most sky for your money, and the lack of setup complexity means you’ll actually use them instead of leaving them in the garage because you can’t face the alignment procedure.
What they’re less good at: Size. A 6-inch Dob is manageable. An 8-inch is hefty. A 10-inch requires commitment and possibly a workout plan. They’re not easily portable for travel, though tabletop versions (like the Sky-Watcher Heritage 130P) solve this at the expense of some aperture. The alt-az mount also can’t track objects automatically, which means you need to manually nudge the scope as objects drift across the sky. This is fine for visual observing but rules out long-exposure astrophotography.
Best for: Beginners who want the most capability per pound, deep-sky enthusiasts, and anyone who values simplicity over compactness.
Reflector vs Refractor Telescope: Quick Comparison
To make this concrete, here’s what £250 gets you in each category:
Refractor (£250): Around 90mm aperture. Sharp views of the Moon and planets. Compact, light, low maintenance. Limited on faint deep-sky objects.
Reflector on tripod (£250): Around 130mm aperture. Good all-rounder. Needs collimation. Equatorial mount can be fiddly. Image quality depends heavily on mount stability.
Dobsonian (£250): Around 150mm aperture. The most light-gathering power of the three. Simple to use. Bulky but sturdy. Needs collimation occasionally.
At every price point, the Dobsonian gives you the most aperture. Whether that matters more than portability or maintenance-free operation is a personal call.
For a technical deep-dive into optical designs, Sky & Telescope has excellent articles on telescope optics.
So Which Should You Buy?
I know you want a definitive answer, but it genuinely depends on your priorities:
If portability and ease are your top priorities → refractor. A Celestron AstroMaster 70AZ or 90AZ will serve you well and fit in the boot of any car.
If aperture per pound is your priority → Dobsonian. A Sky-Watcher Skyliner 150P or 200P will show you things the other two simply can’t at the same price.
If you want a balance → tabletop Dobsonian. The Sky-Watcher Heritage 130P gives you reflector aperture in a compact, grab-and-go package. It’s the telescope I’d recommend to someone who genuinely can’t decide.
And if you get it wrong? It’s not the end of the world. The UK astronomy community has an active second-hand market, and telescopes hold their value reasonably well. Buy something, use it, learn what you wish was different, and upgrade accordingly. That’s how every astronomer I know ended up with their current setup.
The reflector vs refractor debate will never truly be settled because both designs excel at different things. Understanding the reflector vs refractor trade-offs puts you in a much stronger position to choose the right telescope for your needs.
Clear skies.
Daniel is a self-taught astronomy hobbyist based in the north of England. He writes honest telescope guides, gear reviews, and stargazing advice — and remembers what it's like to not know a refractor from a reflector.