Types of Telescopes: A Buyer's Guide to Choosing Right

Getting a clear sky on a night when you actually have time to look through a telescope is rarer than most people expect. The type of telescope you choose determines not just what you can see, but how quickly you give up trying , and that second part matters more than any spec sheet suggests. Exploring the full range of telescopes available before committing to a design is worth more time than most buyers give it.

Different telescope designs reward different habits. A refractor suited to a patient observer who wants crisp lunar views will frustrate someone who bought it expecting galaxy detail. Understanding the trade-offs between designs is what separates a telescope that gets used from one that collects dust in a closet.

What to Look For in a Telescope

Aperture: The Number That Actually Matters

Aperture , the diameter of the telescope’s objective lens or primary mirror , determines how much light the instrument collects. More light means fainter objects become visible and brighter objects show finer detail. This is the single most consequential specification on any telescope’s product page.

A 70mm aperture is workable for the Moon, bright planets, and a handful of the brightest deep-sky objects. At 90mm or 114mm, the list of accessible targets grows meaningfully. Focal ratio (the aperture divided by focal length) matters too: faster focal ratios (f/5 to f/7) give wider fields of view, while slower ratios (f/10 to f/15) compress and magnify the field.

Do not let quoted maximum magnification figures guide your decision. Any telescope can be pushed to arbitrary magnification with the right eyepiece , the image will simply become dim and soft. A practical ceiling is roughly 2× per millimeter of aperture. Above that, atmospheric turbulence and diffraction limits, not the eyepiece, set the ceiling.

Optical Design: Refractor, Reflector, or Compound

Three optical families cover most of what you’ll encounter in this price range. Refractors use a lens to bend light to focus; they require no collimation and are generally robust and low-maintenance, though they grow heavy and expensive as aperture increases. Reflectors use a concave mirror as the primary optic; they deliver more aperture per dollar but require periodic collimation , aligning the mirror cells so the optical axis is correct.

Compound designs (Schmidt-Cassegrain, Maksutov-Cassegrain) fold a long focal length into a compact tube by bouncing light between mirrors and a corrector plate. They are excellent for planetary work and portable, but they cost more at equivalent apertures than a Newtonian reflector.

For buyers new to the hobby, a short-tube refractor or a Newtonian on an alt-azimuth mount represents the lowest-friction entry point. Fewer adjustments needed means more time looking at the sky.

Mount Type and Stability

The mount is half the telescope. An optically capable instrument on a shaky mount will deliver views that feel worse than a weaker instrument on a solid one. Alt-azimuth mounts move in two axes , up-down and left-right , and are intuitive to use. Equatorial mounts align one axis with Earth’s rotation axis and allow objects to be tracked with a single slow-motion control, which matters for astrophotography.

For purely visual work at beginner to intermediate level, an alt-azimuth mount is appropriate and simpler to operate. GoTo motorized systems add alignment steps and battery dependencies but let the mount locate objects automatically , useful if you haven’t yet learned the sky well enough to star-hop.

Eyepieces and Accessories

The eyepieces a telescope ships with are often the weakest component in the package. Most budget and mid-range telescopes include functional but basic eyepieces , worth using while learning, worth upgrading when you identify what’s limiting your views. A 25mm or 32mm eyepiece for wide-field orientation and a 10mm or 12mm eyepiece for higher-magnification planetary work covers most situations.

Finderscopes, red-dot finders, and Telrad-style reflex finders all serve the same purpose: helping you get from naked-eye sky to the telescope’s narrow field of view. Beginners consistently underestimate how disorienting a telescopic field of view is without some kind of finder. Any telescope that ships without a finder of some kind requires that you buy one.

Exploring the complete range of telescope types and accessories before settling on a configuration will prevent the most common beginner mistake: buying on aperture alone and ignoring the rest of the system.

Top Picks

Celestron StarSense Explorer LT 114AZ App-Enabled Telescope

The Celestron StarSense Explorer LT 114AZ is the most capable instrument in this group for a buyer whose primary goal is seeing actual deep-sky objects. A 114mm Newtonian reflector gathers meaningfully more light than any of the refractors here , the aperture advantage is real and it shows on nebulae and star clusters in ways a 70mm or 80mm refractor simply cannot match at comparable price points.

What separates this from a generic 114mm Newtonian is the StarSense technology. The smartphone dock uses your phone’s camera to analyze star patterns and tell the mount where to point. I haven’t used this specific model personally, but Celestron’s implementation of this system has a solid track record across their product line , and for a buyer who hasn’t yet learned the sky well enough to find targets independently, it removes the most common early frustration.

The alt-azimuth mount is not suitable for tracked astrophotography , don’t buy this expecting to photograph galaxies with long exposures. For visual work and casual electronically assisted astronomy with a phone, it’s the right tool. Celestron’s build quality at this segment is consistent and their support documentation is genuinely useful.

Check current price on Amazon.

Hawkko Telescope, 90mm Aperture 900mm

The Hawkko 90mm f/10 refractor sits at the intersection of usable aperture and the low-maintenance character that makes refractors appealing to buyers who don’t want to learn collimation. The 900mm focal length produces a slow f/10 system , narrow field of view, good planetary contrast, and an image scale that works well on the Moon and double stars.

Multi-coated optics matter at this aperture. Without effective coatings, a 90mm refractor bleeds light through reflections off the lens surfaces, and the contrast hit shows in planetary detail. The Hawkko’s coating spec addresses that, though I’d note that “multi-coated” covers a wide range of actual implementations , fully multi-coated (FMC) is meaningfully better than single-layer multi-coating.

The tradeoff is physical size. A 900mm focal length refractor is a long tube on a mount, and portability suffers compared to the shorter-tube designs in this group. For a buyer who wants a dedicated lunar and planetary setup at a fixed observing location, that’s an acceptable trade. For someone who wants to carry the scope to a dark site, the Celestron Newtonian or the Koolpte 80mm makes more sense.

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Koolpte Telescope 80mm Aperture 600mm

An 80mm aperture at f/7.5 puts the Koolpte 80mm in a useful middle position , enough light-gathering to show the Orion Nebula and the Pleiades with some structure, a focal length short enough that the tube stays manageable, and fully multi-coated optics that extract reasonable contrast from that aperture.

The portability claim is the key selling point here and it holds up structurally: a 600mm tube refractor on an alt-azimuth head is a genuine grab-and-go configuration. Temperature changes will shift focus on any refractor , plan to reach for the focuser when you move from indoor to outdoor temperatures and again as the night cools. That’s not a flaw specific to this model; it’s the physics of glass changing refractive index with temperature.

For a buyer who wants something more capable than the 70mm entry-level options but isn’t ready to deal with the collimation that comes with a Newtonian reflector, this is a reasonable step up. The image quality ceiling is lower than the 114mm Celestron, but the operational simplicity is higher.

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Gskyer Telescope 70mm Aperture 400mm AZ Mount

The Gskyer 70mm is the honest answer to the question: “What’s the smallest telescope worth buying?” At 70mm aperture and 400mm focal length, it’s an f/5.7 system , faster than the Hawkko refractor and with a wider native field of view. That makes it better suited to star clusters and wide-field sweeping than to high-magnification planetary work.

The carry bag, phone adapter, and wireless remote in the package target this squarely at the buyer who wants a portable, occasional-use telescope for camping or travel. Those are legitimate use cases, and the 70mm aperture is adequate for them. The Moon looks good through a 70mm refractor. Bright planets show disc structure. The Orion Nebula is visible as more than a smudge.

Set expectations appropriately. This is not a telescope that will grow with you into the hobby , the aperture sets a real ceiling on what’s accessible. It’s a capable instrument for what it is, and “what it is” is an entry-level travel scope that actually fits in a bag.

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Telescope for Adults and Kids 70mm Aperture 300mm

The 70mm 300mm generic refractor shares aperture with the Gskyer but uses a shorter 300mm focal length , making it an f/4.3 system. That faster focal ratio produces a wider field of view at the same eyepiece, which is better for star cluster sweeping and worse for trying to squeeze magnification out of a planetary target.

The wide magnification range quoted (15×, 150×) is technically achievable, but 150× through a 70mm aperture in typical suburban seeing conditions will produce a dim, soft image. The useful range is closer to 20×, 70× for most nights. That’s fine , low magnification wide-field views are genuinely enjoyable and this scope handles them adequately.

This sits alongside the Gskyer at the entry tier. Both are 70mm refractors; the choice between them comes down to whether you want a longer focal length for slightly better planetary contrast (Gskyer) or a wider field of view for cluster sweeping (this one). Neither is a long-term astronomy instrument.

Check current price on Amazon.

Buying Guide

Match the Optical Design to Your Observing Goals

Refractors are low-maintenance and deliver sharp, high-contrast views on the Moon, planets, and double stars. They require no collimation and hold their optical alignment well through transport. The penalty is cost per aperture , a quality 90mm refractor costs more than a 114mm Newtonian reflector, because glass elements at larger diameters become expensive to manufacture without chromatic aberration.

Newtonian reflectors invert and reverse the image, which matters for terrestrial viewing and for star-hopping with a printed chart. For astronomical targets that don’t have an obvious “up,” it’s irrelevant. If your primary goal is deep-sky objects , nebulae, galaxies, star clusters , a Newtonian reflector gives you more aperture per dollar than any other design.

Aperture Tiers and What They Unlock

The 70mm aperture available in two of these options handles the Moon, bright planets, and the top-tier Messier objects , M42, M45, M31 at low magnification. It’s a legitimate starting point, not a toy, but the ceiling is real. At 80mm to 90mm, fainter Messier objects become accessible: globular clusters resolve individual stars more clearly, and the Andromeda Galaxy shows its dust lanes under good conditions.

At 114mm, you’re into territory where the difference in visual experience is substantial on a dark night. Galaxies beyond Andromeda start to appear. The Virgo cluster becomes identifiable as individual smudges rather than nothing. This is the aperture tier where astronomy starts to feel like what it looked like in the book that made you interested in the first place.

Mount Stability and Long-Term Usability

An alt-azimuth mount is the right starting point for visual astronomy. It moves the way your intuition expects , tilt up, swing left , and the learning curve is flat. The limitation appears when objects are near the zenith and the motion becomes awkward, and again if you want to track objects for any sustained period.

Motorized GoTo alt-azimuth mounts, like the Celestron StarSense system, reduce the star-hopping burden significantly. The trade-off is alignment time at the start of each session and battery management. For observers who haven’t yet internalized the major constellations, the alignment assist pays back quickly. For more experienced observers who prefer the discipline of star-hopping, it adds steps to a process they’ve already mastered.

You can find detailed comparisons of mount types across different telescope configurations to help narrow down which setup fits your observing style.

Portability Versus Capability

Every telescope in this group is designed to be portable to some degree, but “portable” means different things across the lineup. The Gskyer 70mm with its included carry bag is genuinely airline-portable. The Koolpte 80mm fits in a car easily and assembles in minutes. The 114mm Celestron Newtonian requires more care in transport , the mirror collimation can drift if the tube takes hard knocks.

If your dark sky site is a 90-minute drive and you’re loading a car, aperture wins. If you’re carrying gear on a hiking trip or fitting it in overhead storage, the smaller refractors earn their place. Be honest about which situation describes your actual observing before deciding aperture is the priority.

Eyepiece Quality and What to Upgrade First

The eyepieces included with budget and mid-range telescopes are adequate for learning but rarely for long-term use. The focuser barrel diameter , 1.25 inch is standard on all these models , determines which aftermarket eyepieces will fit. A quality 25mm Plössl for wide-field orientation and a 10mm or 12mm eyepiece for higher magnification gives you a two-eyepiece kit that outperforms most included sets.

A Barlow lens (typically 2×) doubles the effective focal length of any eyepiece and extends the range of your existing kit without buying additional eyepieces. This is often the highest-value first upgrade on any of these telescopes.

Frequently Asked Questions

What is the best telescope type for a complete beginner?

A short-tube refractor or a Newtonian reflector on an alt-azimuth mount is the easiest starting point. Refractors need no collimation and are ready to use out of the box. The Gskyer 70mm is a fair entry point if portability matters; the Celestron StarSense 114AZ offers significantly more capability for a buyer who is serious about the hobby from the start. Match the design to how you expect to actually use it.

How does a refractor differ from a reflector telescope?

A refractor focuses light through a glass lens; a reflector uses a curved mirror. Refractors require no collimation and hold alignment well through transport, making them lower-maintenance. Reflectors deliver more aperture per dollar , a 114mm Newtonian costs less than a 114mm achromatic refractor of equivalent optical quality. The Celestron StarSense in this group is a Newtonian reflector; every other option here is a refractor.

Will the 70mm aperture options show galaxies?

The brightest galaxies , Andromeda (M31), Triangulum (M33), and a handful of Virgo cluster members , are visible through a 70mm aperture under dark skies, but they appear as faint, diffuse smudges rather than resolved structures. The Hawkko 90mm and especially the Celestron 114mm improve that experience meaningfully. If galaxies are your primary target, prioritize aperture over portability.

Do these telescopes work for astrophotography?

Basic lunar and planetary photography through a smartphone adapter is practical with any refractor in this group , the Koolpte 80mm and Hawkko 90mm both have the focal length to produce identifiable disc images of the Moon and bright planets. Long-exposure deep-sky astrophotography requires an equatorial tracking mount, which none of these include. The alt-azimuth mounts here are not suitable for anything beyond brief exposures.

How often does a Newtonian reflector need to be collimated?

A Newtonian reflector in regular use , transported to dark sites, loaded in and out of a car , should be collimated every few sessions, or whenever star tests at high magnification show asymmetric diffraction rings. A scope that stays on a fixed mount and rarely moves may hold collimation for weeks. Collimation tools (a simple collimation cap costs very little) make the process manageable. It takes about five minutes once you’ve done it a few times.