SVBONY SV520 telescope review: A 90mm beginner scope that works

I’ve spent years peering through all kinds of telescopes, from inexpensive bargain-bin refractors to heftier setups costing well into the tens of thousands. When I got my hands on the SVBONY SV520, which is a 90mm aperture, 800mm focal length refractor bundled with an alt-az mount and a slew of accessories - I approached it with cautious optimism. This is a telescope kit squarely aimed at beginners and families, priced in the budget range but promising features that made even a seasoned hobbyist like me raise an eyebrow. Here’s my honest, no-nonsense review of how the SV520 actually fares under the stars (and a few pitfalls I discovered along the way).

Unboxing and Setup

The SV520 arrived well-packed, and unboxing it felt like opening a starter astronomy lab. In the box: the 90mm optical tube, a small alt-azimuth mount with slow-motion controls, a stainless steel tripod with accessory tray, a 25mm Kellner eyepiece (K25) for 32x views, a 10mm eyepiece (in my kit it was a Plössl for 80x, though some kits only include the 25mm), a 2x Barlow lens (plastic build), a 90° star diagonal mirror, a moon filter, a 5x24 finder (supposedly), a smartphone astronomy adapter kit (with a phone holder that slots into the findershoe, an eyepiece phone holder for photography, and a Bluetooth shutter remote), plus the user manual. Assembly was refreshingly straightforward for me. The manual’s instructions were clear, and I had the tripod set up and telescope mounted in under 10 minutes. The alt-az mount attaches to the tripod with a central bolt, the accessory tray locks the legs in place, and the optical tube slides into a standard Vixen-style dovetail clamp on the mount. It’s essentially tool-free assembly - great for a beginner who might be doing this the first time.

That said, I can see how a total newcomer could get momentarily puzzled by things like the finderscope alignment or the slow-motion cables. I’ve read some user comments about folks struggling to assemble or align the scope properly. From my perspective, the pieces all fit logically: tighten the tripod legs fully, attach the mount, slide in the tube, and secure everything with the big thumb screws. If you do that, you’re good to go. But if you miss a connection or leave something loose, you’ll definitely notice problems (more on that in a second). Overall, as someone who’s built a few scopes, I’d call it an easy setup. For a first-timer, just don’t rush – the process is simple, but each part needs to be snug.

Build Quality and Optical Tube

One of the first things I noticed was that the SV520’s optical tube feels impressively solid for an “entry-level” telescope. The main tube is aluminum alloy with a glossy white finish that’s evenly applied – no drips or cheap feel. It’s actually a pretty handsome telescope to look at, with that classic white tube and black trim. The dew shield on the front is a removable plastic piece; it does its job to prevent dew and stray light, and it’s not flimsy. Underneath, the lens cell holds a 90mm achromatic doublet lens. The glass has a green-toned anti-reflective coating. At first glance the green shine made me wonder if it was just cosmetic, but it’s real coating. In daytime tests, the scope gave a neutral-colored image (no odd tint), and at night only the brightest objects showed a slight greenish or purple fringe – a normal thing in achromat refractors, not some funky cheap lens issue. So, optics-wise, it’s in line with expectations for a 90mm f/8.9 achromat: decent color correction, not apo perfection but perfectly fine for casual stargazing.

The focuser is worth highlighting. SVBONY equipped the SV520 with a single-speed rack-and-pinion focuser made of metal. It’s anodized (ionized) aluminum, with two decent-sized aluminum knobs for fine grip. R&P focusers in this price range can be hit or miss, but this one travels smoothly with just a slight gritty feeling. There’s a focus lock screw on top – handy if you attach something heavy and don’t want the drawtube slipping. I did notice the focuser’s drawtube has  screw heads and an industrial look when fully extended, but that’s a minor cosmetic quibble. Importantly, it held focus well and didn’t wobble under the weight of my heavier 1.25" eyepieces. For most visual use, it’s great. However, the eyepiece holder uses simple thumb screws (no brass compression ring inside), meaning if you try to attach a heavy camera or phone directly in the focuser, it might not grip as evenly. I wouldn’t hang a DSLR off this without expecting some flex – and to be fair, this scope isn’t really meant for advanced astrophotography anyway.

The kit comes with the 5x24 finder, but don’t expect too much from it: these little finders are plastic-bodied with a dim, aberration-filled view - even worse at night. In fact, many astronomers immediately replace 5x24 finders or opt for a red-dot finder instead. Personally, I’d have preferred a simple red-dot finder or a slightly larger 6x30 optical finder in this kit. But, it’s a beginner scope, and beginners really need a working finder out of the box. (I later learned some packages may swap the 5x24 for a red-dot finder in certain markets – something to look out for.)

Mount and Tripod

The SV520 comes with a compact alt-azimuth mount that was a pleasant surprise. If you’ve ever seen a Vixen Porta II or similar alt-az mount with slow-motion controls, this will look familiar. The telescope attaches via a standard Vixen-style dovetail clamp on the side of the mount, meaning you can easily put other small telescopes on it as well – a wonderful bit of versatility not found in many beginner scopes that often have fixed tube mounts. I went ahead and tried mounting a different small refractor and even a lightweight Maksutov on it, and it handled them (as long as they were under about 5 kg, which is the stated payload). This means as you upgrade or experiment, the SV520’s mount could stick around to serve other optical tubes. Big thumbs up for that.

The mount offers slow-motion control knobs on both axes, allowing you to track objects smoothly by turning the cables. This is huge for usability: many cheap alt-az mounts just expect you to shove the scope by hand, which at high magnifications is like trying to do micro-surgery with a hammer. In contrast, the SV520’s worm gear slow-motion knobs let me follow Jupiter or center the Moon with precision. The movement was fairly smooth with only a tiny bit of backlash in one axis – nothing that impeded use. For its class and cost, the mount is one of the SV520’s strongest assets.

Now, the tripod: it’s listed as stainless steel, with adjustable legs and a triangular accessory tray that also braces the legs. Out of the box, I found the tripod a little bit wobbly – frankly, it was downright rickety until I realized some bolts weren’t fully tightened. The connection between the mount head and tripod had a slight play. A quick tightening of the central bolt and a firm twist on all the leg clamps made a world of difference. Once everything was cinched down, the tripod became much more stable. In my shake tests (literally giving the scope a bump and seeing how fast vibrations die out), I got damping times of around 2–3 seconds. That’s not observatory-grade stability, but it’s acceptable for a small scope on a light mount. You do need to use a light touch focusing at high power, but the slow-mo controls help because you’re not physically pushing the scope to track.

It’s worth noting some other users have reported wobbles or shakes with this mount, even mentioning fixes like adding Loctite to certain screws. The reality is, it’s a ~$200 kit – the tripod is not going to be rock solid without a little tuning. It reminds me of a baby giraffe: initially a bit shaky on its legs but finding its footing with a bit of care. I have to be blunt here: if a complete beginner assembles this and doesn’t tighten everything down properly, they might be frustrated by a shaky view. This is something Celestron and other beginner scopes also suffer from – undersized tripods and loose fittings are kind of an endemic problem at this price. The SV520’s tripod, once adjusted, is actually better than many I’ve seen in the same category. The legs are metal (not flimsy aluminum tubes like some), and the overall build is more sturdy than the spindly photo-tripods that come with some department-store telescopes. But I won’t sugarcoat it: out of the box, you might need to spend a few minutes snugging up screws and getting that tray locked in tight. After I did that, the mount+tripod combo was solid enough for enjoyable viewing, and I didn’t feel it was a deal-breaker.

The cool thing about the entire rig is you can easily pick it up and move it around the yard if you need to work your way around obstructions through the night.

One more thing on the mount: because it’s modeled after a Vixen Porta, it has an option to adjust tension and even disassemble if needed. That’s advanced tinkering, but the point is it’s a “real” mount, not a toy one. As a serious amateur, I appreciate that SVBONY included a proper alt-az head here – it adds a lot of value. In comparison, many beginner scopes from bigger brands skimp on the mount, which can lead to a frustrating shaky experience even if the optics are fine. The SV520 mount isn’t perfect, but for slow sweeping across the sky and basic tracking at 80x, it got the job done in a way that felt surprisingly refined for an entry package.

Accessories and Eyepieces that come with the SVBONY SV520

Let’s talk about the goodies that come with the SV520, because they give you an entire starter toolkit in one package. The included eyepieces are a 25mm Kellner (often labeled “K25”) and a 10mm (mine was a Plössl). The 25mm yields about 32x magnification, great for wide views of star fields, large open clusters, and scanning the Moon. The 10mm yields 80x, which is about the upper-middle of what this scope can comfortably do optically. In use, the 25mm provided bright, crisp images. It’s a 3-element design but it performed good enough – I could fit most of the Pleiades in the view and the stars were reasonably sharp across most of the field, with a little blurring at the edge (to be expected at this price). The 10mm gave a tighter view (with smaller exit pupil too): I popped it in for lunar observing and was treated to some nice detail on crater walls. On planets, 80x is enough to see Saturn’s rings separated from the planet and Jupiter’s two main cloud belts on a steady night. The quality of the 10mm was okay; it has a narrower field of view and a short eye relief (you need to get your eye close). It’s perfectly usable, but not a premium ocular by any means. Essentially, these eyepieces get you started, but as a seasoned observer I soon switched to some of my higher-grade eyepieces – and the scope’s optics definitely benefited from that. Beginners won’t mind the included EPs, and I’d rather have these than the truly awful “Huygens” eyepieces some other kits throw in. Think of them as baseline: fine to learn with, and you can always upgrade later for $30–40 a pop when you’re ready.

Also in the box is a 90° star diagonal (mirror type). It’s an all-metal housing with what appears to be a standard mirror inside. The diagonal is important because it lets you observe comfortably by bending the light path – otherwise you’d be craning your neck, especially when the scope points high. The one SVBONY provides is decent. It doesn’t have a filter thread on the nose (so you can’t screw the moon filter into it – you’d instead attach the filter to an eyepiece directly), but optically it seemed fine at the magnifications I tested. Cheap diagonals can sometimes introduce their own blurriness or mis-collimation; I didn’t detect any major issues here. It’s not a high-end dielectric diagonal, but it works and is again better than the plastic diagonals you get in some low-cost sets.

The kit generously includes a Barlow lens – in my case a 2x Barlow, though I’ve seen listings that mention a 3x. Mine was a short, plastic-bodied 2x Barlow. I’ll be straight with you: it feels cheap and I did not have high hopes for it. Barlows of this ilk often add a lot of fuzziness and are mostly marketing fluff to boast “xxx magnification!” on the box. I tried it briefly in daylight and it technically works (it will double your magnification by doubling the effective focal length), but the optical quality suffered. The image got a bit hazy and I could see some internal reflections. Given that the 10mm already pushes the scope pretty high, using the 2x Barlow with the 10mm to get 160x was not a recipe for clarity. I opted not to use the Barlow for any serious night viewing – the scope itself was near its limits at 80x-100x anyway. I consider the Barlow an “extra” that a curious beginner might experiment with, but it’s not a strong point of the package. (This isn’t unique to SVBONY; Celestron and others often bundle poor-quality barlows in their starter kits too.)

The moon filter is a simple screw-in filter that threads onto an eyepiece. It’s basically a neutral density filter that cuts down the Moon’s brightness. It worked as intended – when I observed the nearly full Moon, I threaded the little filter onto the 25mm eyepiece and it made the light comfortable, reducing the glare. There’s not much else to say: it’s a minor accessory, but a nice inclusion since beginners might not know they need one until they get blinded by lunar light. Good to have it in the kit.

Now, onto the smartphone accessories – a sign of the times! SVBONY provides two different phone-related gadgets. One is a phone adapter that grips your smartphone and lines it up with the telescope’s eyepiece for photography (afocal astrophotography). The other is a smartphone holder that can mount on the telescope in place of or alongside the finder, intended to help you use your phone as a finder or navigation device (sort of like those apps that turn your phone into a star map that moves with the scope). Plus, they include a little Bluetooth remote shutter button to click photos without touching the phone. As an avid astrophotography tinkerer, I was both excited and skeptical about these.

The idea of using a phone to capture what you see is fantastic – I’ve done it many times with other scopes – but the execution is tricky. The eyepiece phone adapter (basically a clamp that holds the phone camera over the eyepiece) is a generic design made of plastic. It holds the phone okay for casual use, but when I tried to attach my iPhone 16 Pro Max (quite large and heavy) to the 25mm eyepiece one night, the balance of the telescope shifted. The phone was literally heavier than the eyepiece and diagonal combined, causing some slippage in the focuser drawtube until I really tightened the lock. Even then, the weight of the phone would introduce vibrations every time I tapped the screen. That’s where the Bluetooth remote comes in – you pair it to your phone and can trigger the shutter without physical contact. In theory, this avoids jiggles. In practice, I found that the phone still wasn’t rock-steady in the holder. The clamp had a hard time keeping the phone perfectly aligned when the telescope was pointed high up – gravity kept trying to pull the phone down or at an angle, which messed up the view alignment. After a few frustrating attempts to photograph Jupiter, I concluded that the phone adapter might work better with a smaller, lighter phone, or for taking quick Moon snaps (the Moon is forgivingly bright and big). But for a large phone at night, the mount+adapter combo was wobbly to the point of being impractical. I’ll give credit: the Bluetooth remote is a nice touch; I even used it for some tripod-mounted phone shots of the sky and it worked. Just don’t expect the SV520 to magically become an awesome astrophotography rig because of these phone gadgets. Consider them a bonus toy to experiment with – you might get a decent Moon photo or a shot of Jupiter’s dot with two blurry bands – but the experience can be hit-or-miss.

One cool use for the phone holder (the one that slides into the finderscope shoe) is running a planetarium app and using the phone as a sort of digital finder. I tried an app that uses the phone’s sensors to display the sky in real time. Mounted on the scope, the phone can give you a general idea of where the telescope is pointed relative to constellations. It’s not super precise, but I did manage to roughly locate the Andromeda Galaxy by following the phone’s directions – something a beginner might appreciate on their first nights out. This “smart finder” approach is similar to Celestron’s StarSense Explorer series concept, although SVBONY doesn’t have a proprietary app – you just use any sky map app that has an AR mode. It’s a clever inclusion for the tech-savvy crowd, and I applaud SVBONY for thinking of it. Just remember to remove your phone from the holder before observing; a bright phone screen near the eyepiece is a great way to ruin your night vision and invite mosquito attention!

Under the Stars: Viewing Performance

At the end of the day (literally), a telescope lives or dies by the views it delivers when pointed at the night sky. So how did the SV520 perform for actual astronomy? In a word: respectably, given its limits. I took the scope through a tour of popular beginner targets – the Moon, some planets, and a couple of bright deep-sky objects – to see what a newcomer might experience.

Moon: With the 25mm (32x), the nearly half Moon was gorgeous, hanging in a black sky with lots of craters visible along the terminator (the day-night line on the Moon). The view was sharp and contrasty. I popped in the 10mm (80x) and refocused – the Moon filled a good portion of the eyepiece, and I could pick out finer details like the central peak in Tycho crater and the shadows in Clavius. The chromatic aberration (false color) on the Moon’s bright edge was minimal; I saw a thin fringe of purple on the limb at 80x if I looked for it, but it wasn’t distracting. The image did get a bit softer at 80x than at 32x, which is normal. Still, I spent a long time just roaming across the lunar surface with the slow-motion controls, enjoying the view. The combination of crisp optics at moderate power and the stable tracking of the mount made lunar observing the highlight of this scope for me. I tried the provided moon filter during the fuller phase – it helped tone down the brightness so my eye didn’t ache, though it gives a slight green tint to the Moon. I prefer a neutral gray filter, but hey, included is included.

Planets: Jupiter and Saturn were next. Keep in mind, 90mm of aperture is not a ton, so we’re not going to see Hubble-like detail. At 80x on Jupiter, I could clearly see the four Galilean moons as tiny star-like points flanking the planet. Jupiter itself showed two brownish-gray belts on a bright off-white disk. No, I couldn’t make out the Great Red Spot or intricate swirls – that usually takes more magnification and aperture – but the basic banding was visible, which is satisfying for a newbie scope. The focus had to be precise to get Jupiter sharp, and any residual wobble in the mount was most noticeable here. Using a gentle touch on the slow-mo knobs, I tracked Jupiter as it drifted and the view held steady enough. Saturn at 80x was small but undeniably Saturn. The rings were clearly separated from the globe, looking like a tiny jewel with ears. In moments of steady air (good seeing), I could hint at the dark gap between rings and planet (the Cassini division is too fine for 90mm, but the general silhouette gives an illusion of it). But in all fairness the rings aren't at a good tilt to score the seperation anyway. Colors on Saturn were muted – a pale yellow – but beautiful nonetheless. You can't go wrong with Saturn.

Pushing beyond 80x on planets, I experimented with a higher-power eyepiece of my own (a 6mm, for ~133x). The scope managed it, but the image got dimmer and a bit less sharp. Saturn didn’t reveal more detail, it just got bigger and fuzzier. This aligns with what I expected: about 100x is the comfortable max for crisp views on this scope, maybe 120x on a perfect night. I did try the included Barlow with the 10mm just out of curiosity (for 160x) – the result was a rather mushy Jupiter, so I quickly backed off. The SV520 is not a high-magnification planetary instrument, and that’s okay. It gave me the key sights a beginner wants: Jupiter’s moons and belts, Saturn’s rings. That’s a win in my book for a budget 90mm.

Stars and Deep Sky: One advantage of a 90mm f/8.9 refractor is that stars appear as pinpoints when focused, and there’s no secondary mirror or obstruction (like in a reflector) to scatter light. I pointed at some bright stars like Vega and Arcturus. At focus, they were pretty tight, twinkling Airy disks. Vega did show a very faint bluish halo of chromatic aberration, but again, you had to look for it. On a dimmer star, you wouldn’t notice. I waited until about 1AM and swept to the Orion Nebula (M42), which on a clear autumn night was hanging nicely in the sword of Orion. With the 25mm eyepiece, the nebula appeared as a soft, grayish smudge surrounding the multiple stars of the Trapezium. I could discern a bit of the winged shape of the nebula – certainly not a ton of detail, but enough to be enthralling for someone’s first view of a nebula. A darker sky would have helped; I was in my suburban backyard with moderate light pollution. Next, the Andromeda Galaxy (M31) – I used a low-power, wider eyepiece of my own (a 32mm Plössl, giving ~25x and a wider field) to fit it in view. M31 appeared as a diffuse glow, brighter in the center, fading at the edges. That’s exactly how it looks in a 90mm scope – a faint cloud of light. Don’t expect to see spiral arms or anything (you need much more aperture and dark skies for that). But finding and observing it with this inexpensive setup was rewarding.

Star clusters are a better match for small scopes. The SV520 did nicely on the Pleiades (M45) – the whole cluster fit in the 25mm eyepiece and the stars were sharp and blue-white, a lovely sight. I could even make out a hint of nebulosity around the brightest Pleiads on a very transparent night, which surprised me. The Double Cluster in Perseus was another highlight: thousands of glittering stars speckled across the view, a really pretty scene at 32x. In both cases, the optics delivered good contrast. I didn’t feel like the lens was cutting out too much light or anything – 90mm collects about 65% more light than a common 70mm beginner scope, and that difference was evident on these star-rich targets.

I didn’t do much with binary stars (except Castor, which at 80x was cleanly split into two white points – a nice easy split for a scope like this). Nor did I observe the Sun, since no solar filter was included (ALWAYS use a proper solar filter if you ever try – and never use that dangerous eyepiece solar filter some cheap scopes include; thankfully SVBONY did not include one of those). But it’s good to know that the mount and slow-motion controls would make solar tracking feasible if you got a solar filter separately.

One caution: My particular sample of the SV520 did not exhibit any glaring optical issues like astigmatism or misalignment. Stars were reasonably round inside and outside of focus (I always check this to gauge the optical quality). I mention this because one thorough review I read (by an experienced astronomer) had an SV520 with misaligned optics that caused star images to be astigmatic at higher power. That reviewer had to get the scope adjusted by an expert to fix it. I did not experience that severity of problem – so perhaps SVBONY improved quality control, or I got a better sample. In my case, everything seemed collimated well enough from the factory; straight lines looked straight, and focus snapped reasonably well. If I defocused a star at 80x, the diffraction pattern was concentric enough. So, my experience optically was positive for a scope of this type. I feel it’s important to share that, because consistency can vary in mass-produced optics. I can’t test every unit, but as an owner of one, I was generally pleased that I didn’t encounter an obvious defect. The views were what I’d expect from a 90mm achromat – no more, no less. Crisp at low power, a bit of color and softness creeping in by 100x, and basically out of steam beyond that. A serious amateur wouldn’t be wowed by the optics, but a serious amateur isn’t the target buyer; a beginner or curious backyard stargazer is, and for them the SV520 shows the Moon and planets clearly enough to ignite that spark of discovery.

Comparisons: How the SV520 Stacks Up Against Celestron and other Scopes

In the crowded $150–$250 beginner telescope market, the SVBONY SV520 is up against some well-known players. Brands like Celestron and others have long offered 70mm, 80mm, and 90mm telescopes in this range, often packaged with assorted accessories. Having used a number of those over the years, I’ll draw a few comparisons to put the SV520 in perspective:

Mount and Tripod: This is where the SV520 leaps ahead of many competitors. Celestron’s popular beginner refractors (for example, the AstroMaster 90AZ or the TravelScope 80) often come with alt-az mounts that lack slow-motion controls. Those mounts are basically glorified camera tripods, and at moderate to high power they can be frustrating to use due to jerky movements. Synta has some models like the Observer 90mm which might come on an AZ-3 alt-az mount or a lightweight EQ mount. The Santa (previously Orion) AZ-3 has slow motion but is an older design and can be finicky to balance; their cheap equatorials (like the EQ-1) allow tracking but are notoriously shaky and a bit complicated for beginners. In contrast, the SV520’s alt-az with worm gear slow-mo combines the simplicity a newbie needs (up/down/left/right motion, no polar alignment fuss) with the fine control typically found only on nicer mounts. After tightening it up, I found the SV520 mount steadier than the spindly aluminum tripods on Celestron’s lower-end scopes. It’s not quite as beefy as the mounts on some higher-priced beginner kits (for instance, Celestron’s StarSense Explorer DX series has a decent mount, but those packages cost more and often have smaller apertures). The nearest competitor mount-wise might be something like the Vixen Porta II (often sold separately for ~$200) or the Orion Versago II – which, interestingly, cost nearly as much as this entire SV520 kit! So in mount terms, SVBONY gives you a lot of bang for your buck here. The downside is the initial wobble we discussed; I’d advise any new owner of the SV520 to double-check all screws, which is advice I’d give for any budget scope, honestly.

Optics: A 90mm f/8.9 doublet achromat will perform quite similarly across brands – there’s not a huge mystery here. Orion used to sell a 90mm f/10 refractor (910mm focal length) that’s just a tad slower, potentially showing slightly less chromatic aberration at high power. Celestron’s PowerSeeker and AstroMaster line has a 80mm f/11 and a 90mm f/10 in their lineup too. Those longer f-ratios (f/10, f/11) are old-school designs that actually produce nice sharp optics (as long as the quality is okay) and are forgiving on eyepieces. The SV520’s optics were comparable to the 90mm f/10 Celestron I looked through a while back – in other words, quite decent on-axis sharpness, and modest false color. If anything, SVBONY’s lens coatings might be a bit better than some of the older Celestron ones, which sometimes had that classic purplish MgF2 coating. The SV520’s green multi-coatings seemed to work fine. The difference an average user will notice between these scopes is minor. All will show you Saturn’s rings, Jupiter’s bands, and craters on the Moon similarly. Where SVBONY might edge out is consistency – they’re a newer company but seem to take feedback quickly. The fact that they chose f/8.9 for this scope (as opposed to a “faster” f/6 or f/5 often found in cheap 102mm short-tube refractors) shows they prioritized better optical quality over wide-field low-power only views. Many beginners get lured by “102mm aperture!” on a Celestron or Orion box, only to find a fast f/6 refractor that’s very colorful (chromatic aberration galore) and blurry at high power. The SV520, being slower, actually gives a cleaner planetary image than a typical 102mm f/6 achromat would at similar magnification. Of course, that 102mm might show slightly brighter deep-sky images (due to the larger aperture), but it’s a trade-off. Personally, I’d prefer the better corrected 90mm for a beginner’s all-purpose scope than a “semi-apo filter required” 102mm short tube.

Build Materials: SVBONY touts the “full metal” construction of the SV520, and in large part that’s true – metal tube, metal focuser, metal mount, steel legs. Many Celestron/Synta beginner scopes use a mix of metal and plastic. For example, the focusers on some entry Celestrons are plastic (rack and pinion but plastic drawtube and knobs). The finders are often plastic (and as we saw, SVBONY’s is too or would be if included – that’s a wash). The tube materials vary; most use aluminum tubing similar to SVBONY’s. One thing I liked is that the SV520’s lens cell and focuser are held with standard screws, suggesting collimation could be adjusted if ever needed (not easily, but possible by a technician). Some cheaper scopes literally glue the lens in and rivet the focuser – not the case here. All in all, SV520 feels a bit more “serious” than the ultra-low-cost scopes in terms of build. It reminded me more of an entry-level Sky-Watcher or Meade from back in the day, as opposed to a Walmart special.

Accessories: SVBONY loads you up with accessories, for better or worse. Celestron’s comparable kits (say the AstroMaster 90AZ) might give you two eyepieces and maybe a Barlow or a red-dot finder, but not the smartphone stuff. Orion might give you three eyepieces in some bundles, but often two of them are super cheap ones. So SVBONY including a Plössl 10mm (if you get that version) is on par or better than the Ramsden 10mm some others include. The phone adapter and remote are unique extras here – clearly aiming to appeal to the Instagram/TikTok generation who want to snap pics of the Moon. While I found the phone adapter kludgy, it’s still nice that it’s included for those who want to try. It’s an accessory you’d otherwise have to buy separately (~$15). The moon filter, too, is something Celestron rarely include by default. So the SV520 kit is more complete out-of-the-box. However, quantity isn’t quality: I’d take one decent Plössl eyepiece over three garbage eyepieces any day. SVBONY’s choices weren’t garbage, though – they’re just middle-of-the-road. In essence, the SV520 spares a beginner from needing to immediately buy anything else (except maybe a planisphere or a beginner’s astronomy guidebook). That’s a strong value proposition, especially for parents buying this as a gift.

Overall Performance: If I stack the SV520 up against, say, an Orion AstroView 90 (ahem, I mean Celestron) (with its EQ-2 equatorial mount) – I prefer using the SV520. The Orion’s equatorial is heavy and a bit unwieldy for a beginner, despite being stable. The SV520’s alt-az with slow-mo is much easier to handle and more inviting for casual observing. Versus a Celestron 102AZ (short tube, no slow-mo): the SV520 shows a cleaner image at high power and the mount is better for fine adjustments, but the 102AZ would have a wider low-power field (nice for big objects like the Andromeda galaxy). I think SVBONY struck a good balance with the 90mm size and f/8.9 focal ratio for an all-rounder beginner scope. It’s the kind of spec that old hands would recommend if asked “what telescope should I start with?” – a 3 to 4 inch refractor around f/9 on a simple mount. And here it is.

For around $200 (the price I’ve commonly seen online), this kit is punching above its weight. You’d be hard-pressed to find a similarly priced competitor that includes an alt-az mount with slow motion, two usable eyepieces, and all the extra trimmings. Many beginners on forums have commented that the SV520 felt like a much better deal than the typical “Christmas special” telescopes that flood the market each holiday season. I agree – it’s a cut above the bottom tier. It’s not quite a premium beginner telescope (those might be something like an Sky-Watcher Dobsonian or a higher-end refractor on a solid mount), but it’s one of the best I’ve seen in the sub-$250 category in terms of completeness and clever design choices.

My Verdict for the SVBONY SV520

I approached the SVBONY SV520 with an analytical eye and a healthy dose of skepticism – and it managed to both impress and irritate me in different ways. In summation, it’s a very capable beginner telescope that delivers on its core promises while still showing a few rough edges that remind you of its budget nature. Would I recommend it to a friend or relative looking to get into astronomy? Yes, with caveats. Let me break down the pros and cons plainly:

Pros:

Solid Optical Performance (for its class): The 90mm achromat provides clear, bright views of the Moon, planets, and stars at low-to-mid powers. It’s a legitimate telescope, not a toy – you can see Saturn’s rings, Jupiter’s moons, lunar craters, and more in satisfying detail for a newcomer.

Robust Build: Metal optical tube and focuser, and a largely metal mount/tripod make it feel like a “real” piece of equipment. The scope can take standard accessories and even mount other small telescopes, giving it some longevity beyond the beginner phase.

Excellent Mount for Beginners: The alt-azimuth mount with worm-gear slow motion controls on both axes is a standout feature. It makes tracking objects intuitive and smooth, which is critical for keeping a beginner engaged (nothing worse than a shaky, jumpy mount – SV520 avoids that once properly tightened). Plus, the standard dovetail mount means you’re not locked into proprietary hardware.

Complete Accessories Package: It comes with everything you need to start – two decent eyepieces covering low and medium magnification, a diagonal, a barlow, a moon filter, and even smartphone adapters. There’s a lot of value in the box, sparing a novice from making extra purchases immediately.

Easy to Assemble and Use: Apart from needing to snug some screws, the general setup is quick. Operation is straightforward point-and-look. I appreciated that the manual was clear (not always the case with imported scopes). This telescope is clearly aimed to get a family or beginner up and running in one evening without special tools or prior knowledge.

Cons:

Tripod Wobble (Out of the Box): The tripod can be wobbly until you tighten everything down. My unit had a loose mount attachment out of the box. While this was easily fixed, it’s not great that a beginner might have to troubleshoot stability issues on day one. Some users might not realize a simple tightening is needed and could be frustrated with shaky views initially. In other words, quality control on the assembly could be better – I’d love if it was rock solid from the get-go.

Subpar Finder Solution: The 5x24 finder scope is tiny and of limited use – and in my case it was inexplicably missing. Assuming most kits include it, it’s still not a great tool for aiming. Many beginners will struggle with such a small finder (dim view, inverted image, chromatic aberration). Plan on upgrading to a better finder or using the smartphone-mount method for navigation. It’s a shame to include a weak link in an otherwise well-thought-out kit.

Cheap Barlow and Mid-range Eyepieces: While the included eyepieces are serviceable, they don’t fully exploit the telescope’s capability. The cheap plastic Barlow lens, in particular, isn’t really usable for quality viewing – images get blurry with it. So effectively, you have one high-ish power (80x) until you invest in a better Barlow or additional eyepieces. Similarly, the eyepieces have narrow fields of view compared to modern designs. This is common in beginner scopes, but it’s worth noting that the first upgrades you’ll likely crave are a wider-field low-power eyepiece and a sharper high-power eyepiece.

Not for High Magnification: Don’t expect to push much beyond 100x with good results. The scope’s optics and focuser just aren’t optimized for extreme magnifications. If your aspirations are to routinely observe planets at 150–200x or split tight double stars, you’ll find the SV520 limiting. It’s best appreciated as a low-to-mid power sweeper of the skies. This isn’t a “con” per se given the price, but it’s a reality check – some marketing might boast high power, but in practical use the views get soft beyond the included range.

Smartphone Adapter Difficulties: The phone camera adapter, while a neat inclusion, can be frustrating with large/heavy phones. It doesn’t secure enough to prevent all movement, so getting a clear photo through the eyepiece can be an exercise in patience. I consider this a minor con – it’s a bonus accessory after all – but it could lead to disappointment if someone bought the scope mainly to do phone photography. In my experience, it’s fine for casual Moon shots, but planets and stars likely won’t turn out well without a lot of fiddling. The concept of using a smartphone as a pseudo-GoTo guide is promising but requires the user to figure out apps and alignment, which might be too much for some beginners to bother with.

My take is that the SVBONY SV520 is a refreshingly good beginner telescope package that manages to avoid most of the classic pitfalls of its price peers. It feels like it was designed by people who actually understand amateur astronomy. The mount is a joy for its class, the optics show you exactly what a 90mm refractor should, and the overall experience is more “serious amateur” than “kiddy toy.” My personal time with it was enjoyable – I found myself smiling at Saturn and the Moon just as I did years ago with my first scope, and that says a lot. I also found myself muttering under my breath when I encountered the loose tripod bolt and the useless finder, which says that there’s still room for improvement.

For a beginner or a family looking for a first telescope under about $200, the SV520 is one I would recommend with the advice that they tighten it up well and manage their expectations on the included accessories. It’s not a magic portal to the galaxies – no telescope at this level is – but it is a sturdy bridge to the Moon, planets, and brighter deep sky objects that can ignite a lifelong interest in the night sky. In plain terms, it’s a great starter scope: one that gives you a taste of everything, with real usability, and doesn’t immediately fall apart or require another $200 of fixes to make it enjoyable.

SVBONY, as a somewhat newer player, has impressed me with the value here. I’d call the SV520 kit a smart alternative to the usual suspects from bigger brands. It’s for the person who wants an affordable telescope that isn’t total junk – something to learn on, to share with kids on a camping trip, or to have on a patio for those clear nights when the Moon is inviting. Just be ready to tighten a screw or two, possibly toss aside a cheap component now and then, and you’ll have a capable little observatory at your command.

The Svbony SV520 Telescope Kit – Worth It for Beginners? Another review by Naztronomy

Buy the SV520