Celestron Showdown: Battle of the 10x42s

If you’ve ever shopped for binoculars as a beginner, you’ll have probably noticed that they all look similar, they’re packed full of jargon about coatings and prisms, and the price tags range from “that’s cheaper than going out for dinner” to “I could buy a used car for that”. This is particularly apparent in the world of 10x42 binoculars — the Goldilocks size that’s just right for just about everything, from spotting birds in the garden to sweeping across the night sky.

So why should you go for a 10x42? In short, it’s the jack-of-all-trades of binocular specs; ideal if you want to look at a variety of general subjects without necessarily specializing in a particular niche. The 10x magnification gets you close enough to see detail without resulting in too much shake, and the 42mm objective lenses gather plenty of light without weighing you down. It’s no surprise that this size is the best seller across almost every brand.

But here’s the catch: not all 10x42s are created equal. The glass, coatings and materials can be the difference between “hey look, there’s a bird” to “wow, I can see every feather”. Celestron offers six models across four different ranges in this size — Outland X, Nature DX (plus an ED version), TrailSeeker (plus an ED version) and Regal ED. These range from budget-friendly to “treat yourself,” with each step up adding a little more sophistication (and a little more strain on your wallet).

We took all six models to a nature reserve to compare them side by side, to determine which one you should invest your money in and which ones to avoid.

Meet the contenders

How the tech evolves as you spend more

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We've all heard the saying "you get what you pay for." This is particularly true when it comes to optics. At first glance, all of these models wear the same 10x42 badge. But binoculars are like cakes: it's the same flour and sugar, but you get different results based on the quality of the ingredients.

Coatings
The Outland X makes do with basic multi-coated lenses, which are fine for daytime use but lacking after dark. Nature DX upgrades this to fully multi-coated optics with phase-coated prisms, which sharpen the contrast and reduce glare. TrailSeeker and Regal ED both combine phase and dielectric prism coatings with fully coated lenses, delivering the clearest, brightest view of the lot.

Glass
ED (Extra-low Dispersion) glass keeps different wavelengths of light focused together, reducing the purple or green fringing that appears around bright edges. The Outland X series has no ED option, while the Nature DX and TrailSeeker offer both standard and ED models. The Regal is only sold as an ED version, and its flat-field technology also maintains edge-to-edge sharpness.

Build quality and materials
The Outland X and Nature DX models are built with polycarbonate bodies clad in rubber armor — durable enough, but can feel a little plasticky. The TrailSeeker and Regal series upgrade to a magnesium chassis and rubber armor, which feels tougher yet lighter in extended use. However, all six models are waterproof and nitrogen-purged to prevent fogging.

Results

6th place: Celestron Outland X

The Celestron Outland X series is designed for outdoor enthusiasts who want a rugged, durable pair of binoculars that won't cost the earth. If you aren't too bothered about having amazing detail, contrast or overall image quality, the Outland X will fit the bill if you absolutely cannot stretch your budget.

During our tests, they unsurprisingly performed the worst in most cases, but that's to be expected in a budget pair of binoculars. If you were to look through them on their own, they appear to do the job at first glance, but when you compare them directly to the other 10x42 models, it becomes obvious where they fall short.

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There was noticeable chromatic aberration around high-contrast subjects, and the overall picture was softer and duller than the rest of the lineup. The build quality feels solid yet lightweight, although it lacks some of the premium features you'll find on the more expensive models. Still, it's waterproof and nitrogen-purged to prevent fogging, which is important for an outdoor binocular. The focus wheel is fairly smooth, although the diopter is noticeably stiffer than the other models.

Overall, we'd recommend the Outland X series if you just want to get a closer look at subjects without spending too much money, and you aren't bothered about having highly detailed views. We're not sure we'd pay $119 for the 10x42, so it might be worth waiting for Black Friday to take advantage of a deal, or downsizing to the 8x25 or 10x25 if you don't need to use them in low light.

Would we buy them? No.

• Read our full Celestron Outland X 10x42 review

5th place: TrailSeeker

In the TrailSeeker, we see the introduction of phase and dielectric-coated prisms. The latter enables more light to be reflected off the prism, resulting in a brighter image than the Nature DX and Outland X, which only have phase coating. The combination of phase and dielectric maximizes light transmission, making this pair better suited for wildlife observation in low light and stargazing. The differences in brightness, sharper image quality and reduced glare compared to the Nature DX are small, but noticeable. The build has also been upgraded to lightweight and durable magnesium alloy.

When we tested them out at a nature reserve, we noticed a fair amount of chromatic aberration when observing ducks on a pond, which was completely eliminated once we switched to a pair with ED glass. There's a bit of fringing around the moon, and we enjoyed using them for stargazing as they are comfortable to use for long periods.

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Putting the TrailSeeker in fifth place does feel a bit harsh, because they are undoubtedly a fantastic pair of binoculars. Before we introduced the ED models into our group test, the TrailSeeker was initially our favorite. However, the addition of the Nature DX ED, in particular, has presented a better option for a lower price, so it's hard to justify placing the TrailSeeker any higher.

Overall, the TrailSeeker performed very similarly to the Nature DX, and although they were slightly better in terms of sharpness, brightness and overall clarity, we didn't notice enough of a difference to make the price jump worth it. At the end of it, it came down to value for money.

Would we buy them? No, but only because there are better options — not because there's anything wrong with these ones.

4th place: Celestron Nature DX

It's easy to see why the Nature DX is a bestseller. They offer a great balance of decent performance and affordability, making them good for beginners and hobbyists who want to get their money's worth without having to spend too much on exceptional optics.

We took them to our local nature reserve and struggled to make out finer details when observing waterfowl. There was also noticeable color fringing on birds and trees, both near and in the distance. For this reason, we wouldn't recommend them for birdwatching, specifically, but they performed quite well for stargazing and general purpose viewing.

In many of our tests, the Nature DX actually performed very similarly to the more expensive TrailSeeker, with only a fraction of a difference in sharpness across the frame, chromatic aberration and overall brightness. For more casual users, these differences certainly won't warrant spending the extra $100-$140 to upgrade to the TrailSeeker.

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The Nature DX is the lightest of the six models, and the weight difference is particularly apparent when compared to the Regal. They're perfectly suited to throwing in your bag on a hike or taking on camping trips where you'll want to view a whole range of subjects, and we think they're good value for money overall — but we would pay the extra to upgrade to the Nature DX ED.

Would we buy them? No, we'd pay the extra for the ED variant.

• Read our full reviews of the 8x42 and 12x56 variants

3rd place: TrailSeeker ED

This is where the fun starts. The TrailSeeker ED are bright, sharp and excellent in low light, and we have no complaints about them at all. So, why have we placed them third, you may ask? Well, the pricing makes them a bit redundant when the Nature DX ED and Regal ED are on the table. Although the TrailSeeker ED are slightly better than the Nature DX ED, we don't think they're worth the extra cost, so we'd recommend the Nature DX ED for beginners or anyone on a budget.

On the other end, the Regal ED has everything the TrailSeeker ED has, plus flat-field technology to improve edge-to-edge sharpness, but the TrailSeeker ED are more expensive, so it's a no-brainer there as well.

The TrailSeeker ED is fantastic, but the problem is that the price prevents our being able to recommend them, as there's always a more attractive option.

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During our group test at the nature reserve, we noticed the TrailSeeker ED was definitely brighter, sharper and clearer than the Nature ED, but again, not by the kind of margin that might warrant such a huge price jump. The trees in the distance had more definition, so the TrailSeeker ED would be better for long-distance viewing, specifically, in addition to low-light observation. The TrailSeeker ED was also much more detailed than the standard TrailSeeker when we were looking at leaves on a pond. They're fantastic for both birdwatching and stargazing, but we just wish they were priced better.

The TrailSeeker ED was one of two pairs where we felt truly immersed in the scene we were observing. With the other four pairs, it felt obvious that we were looking through binoculars.

Would we buy them? Currently, no. If they were cheaper, yes.

2nd place: Nature DX ED

Financially, the Nature DX ED seems to make the most sense out of Celestron's lineup. While they don't quite have the optical power of the Regal ED, the Nature DX ED still excels in comparison to the Nature DX and TrailSeeker, and packs a lot of punch for the price.

We noticed a big reduction in chromatic aberration when comparing them against the normal Nature DX and TrailSeeker models, both for close-up viewing and objects in the distance. This was particularly apparent when observing birds in flight, and when peering at a bright moon, where we barely noticed any color fringing whatsoever.

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For birdwatching, there wasn't a huge amount of difference between the Nature DX ED and the TrailSeeker ED, despite the latter having dielectric coatings. While the TrailSeeker ED had the edge overall, the Nature DX ED give more bang for your buck and are fantastic overall.

Despite their polycarbonate build, we think they're an excellent choice that combines substance with affordability.

Would we buy them? Yes.

• Read our full Celestron Nature DX ED 10x42 review

Winner: Regal ED

Regal by name, regal by nature. These powerful 10x42s seem to tick all the boxes, and after spending some time with them, we are impressed — particularly after we spent a couple of nights stargazing with them in the Bannau Brycheiniog National Park in Wales, enjoying sights of Andromeda, the Summer Triangle and the Coathanger asterism.

The feature that sets them apart from the other models, which could arguably make it a little unfair to compare them, is their flat-field technology. This eliminates the natural curvature that typically occurs with standard convex lenses, to ensure edge-to-edge sharpness across the entire field of view. As you can see from the graphic further up the page, we found these to be the sharpest binoculars by far.

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They also come with ED objective lenses as standard, whereas the other models don't. They offer the same prism and lens coatings as the TrailSeeker models, along with the same field of view and body materials.

The views were tack-sharp throughout, with bright, contrasty views in any light. The moon looked perfect with no color fringing, and we could easily follow a Kingfisher dancing above a pond with no issues at all. Like the TrailSeeker ED, we felt truly immersed in the scene as opposed to feeling like we were looking through binoculars.

If we're being picky, their weight could potentially deter users who are looking for a more lightweight and compact pair of binoculars. Not only is the Regal the heaviest of the lot, but the eyecups are the biggest, and we found them to be bigger than our eye sockets (yet another unrealistic beauty standard!). This meant we couldn't, for lack of a better term, get our face in them properly without being a little uncomfortable.

This shouldn't deter you, as this is just a personal preference, but it's small details like this that can make a big difference in finding the right pair of binoculars for you.

Would we buy them? If we were serious about birding, yes.

• Read our full Celestron Regal ED 10x42 review