Binoculars
Celestron Nature DX 8x42 review
The non-ED model, judged on its own terms — and the reason it beats both the 10x42 and its own expensive twin after dark.
By Scooter M. · published October 18, 2026
I'm not an astronomer and I don't have a lab. I'm someone who's genuinely into this — I read the manuals, compile the published specs, and do the arithmetic the box doesn't do for you. No lab coat. How we pick.
How this is funded. Lens & Lightyear earns a commission when you buy through a link on this page, at no extra cost to you. It does not change which products we pick or what we say about them — every card below carries a real reason to skip it. Prices are pulled live and were last verified October 18, 2026. Full disclosure.
The short answer
For stargazing, the standard Nature DX 8x42 is the right Nature DX. Its 5.25mm exit pupil makes it visibly brighter at night than the 10x42, 17.5mm of eye relief keeps it comfortable in glasses, and the ED version's premium buys a fix for a problem that stars barely show. Buy this one and spend the difference on a tripod adapter.
This page exists because the site had reviews of the ED version and of the format comparison, but none of the standard 8x42 itself — which is the pair we actually recommend most often for a family that wants one set of binoculars for everything.
The full published specification
| Specification | Nature DX 8x42 (item 71332) |
|---|---|
| Magnification | 8x |
| Objective diameter | 42mm (1.65") |
| Exit pupil | 5.25mm (.20") |
| Eye relief | 17.5mm (.69") |
| Angular field of view | 7.4 degrees |
| Linear field at 1000 yds | 388 ft (129 m) |
| Prisms | BaK-4 roof, phase coated |
| Coatings | Fully multi-coated |
| Close focus | 6.5 ft (2 m) |
| Weather sealing | Waterproof, nitrogen filled |
| Interpupillary range | 56mm-74mm |
| Tripod adaptable | Yes (adapter not included) |
| Weight | 22.2 oz (629 g) |
| Warranty | Limited lifetime |
Celestron's published specifications for item 71332, linked below. Bold marks the two figures that decide the pair for night use.
Why the exit pupil is the number that matters after dark
Exit pupil is objective diameter divided by magnification, and it is the width of the beam of light leaving the eyepiece. If that beam is narrower than your pupil, you are throwing away aperture you paid for.
- 8x42 gives 5.25mm. Close to a dark-adapted adult pupil, and comfortably inside a child's, which opens wider than an adult's.
- 10x42 gives 4.2mm. Same objective, same light collected, but spread across more magnification — so the image is dimmer in the same sky.
- 7x50 gives 7.1mm. Wider than any eye can use, which is why the Cometron looks so bright and why it is the value answer for astronomy alone.
- What it does not tell you is resolution. A wide exit pupil is a brightness statement, not a detail one.
We work the whole calculation through, with the arithmetic shown, on the best binoculars for stargazing.
Quick picks
The 8x42, and the two pairs it is usually compared against
| # | Product | Best for | Price |
|---|---|---|---|
| 1 |  Celestron Nature DX 8x42 5.25mm exit pupil, 17.5mm of eye relief, 388 ft at 1000 yards, waterproof. | One pair for both daylight and stargazing, used by more than one person | |
| 2 |  Celestron Nature DX 10x42 The same 42mm objective at 10x — more magnification, a 4.2mm exit pupil, less field. | Daytime detail, and steady adult hands on the Moon | |
| 3 |  Celestron Cometron 7x50 50mm objectives at 7x — a 7.1mm exit pupil and the steadiest view here. | Pure night-sky value at a fraction of the price |
Rows link to the full write-up further down this page. Prices come from the live price layer only; where there is no live figure the button reads “Check price” rather than showing a number we remembered.
The three comparisons buyers actually make
| Against | The real difference | Our verdict |
|---|---|---|
| Nature DX 10x42 | 4.2mm exit pupil, 304 ft field, 14mm eye relief | 8x42 for stargazing. 10x42 only if daylight detail leads |
| Nature DX ED 8x42 | ED glass, 7.5 degrees, 17.8mm relief, 24.9 oz | 8x42. ED fixes color fringing, which stars barely produce |
| Cometron 7x50 | 7.1mm exit pupil, no weather sealing, much cheaper | Cometron if astronomy is the only use |
| Nature DX 8x32 | Lighter and smaller, narrower objective | 8x32 for a child's own pair — see binoculars by age |
Who it is genuinely for
| Situation | Verdict |
|---|---|
| One pair for a family, day and night | Yes. This is the pick. |
| An adult who observes in glasses | Yes — 17.5mm of eye relief is the reason. |
| A child's own first binocular | No. 22.2 oz is too much; see binoculars by age. |
| Astronomy only, tightest budget | No. The Cometron 7x50 is better value. |
| Lunar and planetary detail | No. You want more magnification and a tripod — see which SkyMaster. |
| Daytime birding on high-contrast edges | Consider the ED version instead. |
The accessory it actually needs
The barrel is threaded for a tripod but no adapter is included. At 8x you can hand-hold usefully for a while, but for any long look at one object — and especially for a child — mounting it transforms what you can see. The bracket costs a fraction of the binocular; we cover the fitting and the pitfalls on binocular tripod adapters.
What we did and did not do
We have not tested these binoculars. Every figure above was read from Celestron's published specification page for item 71332 on the date at the top of this page, and that page is linked below. The exit pupil arithmetic is our own, run on Celestron's published aperture and magnification, and a reader can check it against the same spec sheet.
We publish no rating and no review count, because we have measured nothing. Prices come only from our live feed with the date they were checked. Our full method is on the methodology page.
The picks in full
Pick 1
Celestron Nature DX 8x42
One pair for both daylight and stargazing, used by more than one person
The arithmetic
Objective divided by magnification gives the exit pupil: 42 / 8 = 5.25mm, which is what Celestron publishes. That is wider than a dark-adapted adult pupil needs on most nights and far wider than the 4.2mm of the 10x42, which is why this pair looks brighter in the same sky. It also holds 17.5mm of eye relief against the 10x42's 14mm, and shows 388 ft at 1000 yards against 304 ft — 28 percent more sky in the circle.
The arithmetic that decides this pair takes one division. 42 divided by 8 gives a 5.25mm exit pupil — the width of the light cone leaving the eyepiece — and under a night sky that is the number that sets how bright the view looks.
A dark-adapted adult pupil opens to somewhere around 5 to 7mm, and a child's opens wider still. At 5.25mm this pair very nearly fills it. The 10x42 manages 4.2mm from the same objective, and the difference is visible on the same night on the same target.
17.5mm of eye relief is the specification that makes it usable in glasses, which the 10x42's 14mm does not comfortably manage. For a pair that will be handed between a parent in spectacles and a child without, that matters more than the magnification difference.
388 ft of field at 1000 yards (7.4 degrees) is 28 percent more sky in the circle than the 10x42's 304 ft. On a sweeping target like the Milky Way through Cygnus, that is the whole experience.
Honest downsides: 22.2 oz is genuinely heavy for a child to hold steady for long, there is no tripod adapter in the box although the barrel is threaded for one, and 8x will not pull in lunar crater detail the way a 15x70 does.
Skip it if
You want maximum detail on the Moon, or you are buying for small hands. At 22.2 oz and 8x this is a steady, bright, general pair rather than a specialist one.
| Item number | 71332 |
|---|---|
| Magnification | 8x |
| Objective diameter | 42mm (1.65") |
| Prisms | BaK-4 roof, phase coated |
| Coatings | Fully multi-coated |
| Angular field of view | 7.4 degrees |
| Linear field of view | 388 ft at 1000 yds (129 m) |
| Exit pupil | 5.25mm (.20") |
| Eye relief | 17.5mm (.69") |
| Close focus | 6.5 ft (2 m) |
| Weather sealing | Waterproof, nitrogen filled |
| Interpupillary range | 56mm-74mm |
| Tripod adaptable | Yes |
| Weight | 22.2 oz (629 g) |
| Warranty | Limited lifetime |
| What the box does not do | No tripod adapter in the box, though the barrel is threaded for one. 22.2 oz is heavy for small hands, and at 8x it will not pull in as much detail on the Moon as a 10x or 15x pair. There is no image stabilization at any price near this. |
Specifications from Celestron — Nature DX 8x42 specifications. We have not handled this one — everything above is the published spec sheet plus our own arithmetic on it.
Pick 2
Celestron Nature DX 10x42
Daytime detail, and steady adult hands on the Moon
The arithmetic
Same 42mm objective and the same published 22.2 oz as the 8x42, so everything here is a consequence of the magnification alone: 42 / 10 gives a 4.2mm exit pupil against 5.25mm, the field narrows from 388 ft to 304 ft at 1000 yards, and eye relief drops from 17.5mm to 14mm. The gain is 25 percent more magnification on the same light grasp.
Identical in every respect except magnification, and every difference flows from that one change: a 4.2mm exit pupil, 304 ft of field and 14mm of eye relief.
The gain is 25 percent more magnification on the same light grasp, which is real and useful in daylight and on the Moon.
The cost is a dimmer night view, a tighter eyebox and more visible hand shake. Full review, and the direct comparison.
Skip it if
Stargazing is the main use, you observe in glasses, or a child will be holding it. The 4.2mm exit pupil is dimmer and 14mm of eye relief is tight.
| Item number | 71333 |
|---|---|
| Magnification | 10x |
| Objective diameter | 42mm (1.65") |
| Prisms | BaK-4 roof, phase coated |
| Coatings | Fully multi-coated |
| Angular field of view | 5.8 degrees |
| Linear field of view | 304 ft at 1000 yds (101 m) |
| Exit pupil | 4.2mm (0.16") |
| Eye relief | 14mm (0.55") |
| Close focus | 6.5 ft (2.20 m) |
| Weather sealing | Waterproof, nitrogen filled |
| Interpupillary range | 56mm-74mm |
| Tripod adaptable | Yes |
| Weight | 22.2 oz (629 g) |
| Warranty | Limited lifetime |
| What the box does not do | 14mm of eye relief is tight for anyone observing in glasses. The narrower 4.2mm exit pupil makes it dimmer than the 8x42 under the same sky, and 10x magnifies hand shake as well as the target — the point at which a tripod adapter stops being optional for long looks. |
Specifications from Celestron — Nature DX 10x42 specifications. We have not handled this one — everything above is the published spec sheet plus our own arithmetic on it.
Pick 3
Celestron Cometron 7x50
Pure night-sky value at a fraction of the price
The arithmetic
Exit pupil is objective divided by magnification: 50 / 7 = 7.1mm, which matches Celestron's published figure. That is the single most useful number here. A fully dark-adapted young pupil opens to around 7mm, so a child uses nearly all of that 7.1mm cone and the view is as bright as the optics can make it. An adult over about forty typically dilates to 5mm or less and simply cannot use the extra — this is one of the rare cases where a child gets more out of the hardware than the grown-up does.
The honest value check. For astronomy specifically, aperture and exit pupil beat glass quality at this price level, and 50 divided by 7 gives a 7.1mm exit pupil — wider than any human eye can fully use.
7x is also the most forgiving magnification there is to hold steady, which for a child is often worth more than optical refinement.
What it gives up is the Nature DX's waterproof nitrogen-filled body, its 6.5 ft close focus and its daylight versatility. Full review.
Skip it if
You need weather sealing, close focus or a compact pair for daylight. This is a big-eyed night instrument and bulky in a bag.
| Magnification | 7x |
|---|---|
| Objective lens | 50mm (1.97") |
| Prism glass | BK7 porro |
| Lens coatings | Multi-coated |
| Angular field of view | 6.6 degrees |
| Linear field at 1000 yds | 344 ft (105 m) |
| Exit pupil | 7.1mm (.28") |
| Eye relief | 13mm (.51") |
| Close focus | 26.2 ft (8 m) |
| Weight | 27.3 oz (774 g) |
| Tripod adaptable | Yes |
| Environmental | Water resistant |
| What the box does not do | 27.3 oz is heavy for small arms held up at the sky — plan on leaning against a wall or lying on a blanket, or add the tripod adapter. BK7 prisms are the cheaper glass and show slight softening at the edge of the field. Water resistant is not waterproof. |
Specifications from Celestron — Cometron 7x50mm specifications. We have not handled this one — everything above is the published spec sheet plus our own arithmetic on it.
Questions people actually ask
- Is the Celestron Nature DX 8x42 good for stargazing?
- Yes. Its 5.25mm exit pupil is close to a dark-adapted pupil, so it delivers most of the light the 42mm objectives collect, and 388 ft of field at 1000 yards shows a wide sweep of sky. It is the Nature DX we recommend for night use over both the 10x42 and the ED version.
- Is the Nature DX 8x42 or 10x42 better?
- For stargazing, the 8x42: a 5.25mm exit pupil against 4.2mm makes it brighter, 17.5mm of eye relief against 14mm makes it comfortable in glasses, and it shows 388 ft of field against 304 ft. The 10x42 is the better choice only if daytime detail is the main use.
- Is the ED version worth the extra money?
- Not for astronomy. ED glass reduces chromatic aberration, which appears on high-contrast daylight edges rather than on stars against a dark sky. The ED model is also 2.7 oz heavier. For daytime birding it is a real improvement.
- Is the Nature DX 8x42 too heavy for a child?
- For a child's own pair, usually yes — 22.2 oz is a lot to hold steady, and arm fatigue ends a session faster than anything optical. A lighter 8x32 or a 4x30 suits smaller hands better.
- Does it come with a tripod adapter?
- No. The barrel is threaded to accept one, but the adapter is sold separately. For long looks at a single object, and especially for children, mounting it makes a substantial difference.
- Is the Nature DX 8x42 waterproof?
- Yes. Celestron lists it as waterproof and nitrogen filled, which also prevents internal fogging when it is taken from a warm house into cold night air.
Sources
Read next
Where to go from here
- Celestron Nature DX 10x42 review
25 percent more magnification on the same 42mm objective — and a 4.2mm exit pupil, 14mm of eye relief and 304 ft of field as the price. When that trade is worth making.
- 8x42 vs 10x42: the same binocular, one number apart
Celestron publishes both versions of the same binocular, so the comparison is unusually clean: 5.25mm exit pupil against 4.2mm, 388 ft of field against 304 ft, 17.5mm of eye relief against 14mm.
- Celestron Nature DX ED 8x42 review
Every published difference between the ED and standard Nature DX 8x42, laid out — and an honest answer on whether extra-low dispersion glass is worth the premium for stargazing.
- The best binoculars for stargazing with kids
The exit pupil calculation that decides which binoculars suit a child, and what a 7x50 actually shows on a first clear night.
- Putting binoculars on a tripod: adapter, tripod, and the height nobody checks
The cheapest fix for the most common binocular disappointment. Which binoculars accept an adapter, what tripod height actually matters for looking up, and what this will not fix.
- The best stargazing binoculars under $100
Three pairs under $100, judged on exit pupil, prism glass and steadiness rather than on magnification claims — plus the two corners this budget always cuts.