Celestron Luminos 7mm — image 1
Celestron

Celestron Luminos 7mm

A 7mm Celestron Luminos: a medium-high-power eyepiece for planets, globular cores and small planetary nebulae, from an affordable 82-degree ultra-wide that puts the big-field experience within reach.

81/ 100
Polaris Score
Optical quality · Immersion · Comfort · Value
See the breakdown ↓
What it's for
Low power · wide fieldHigh power · narrow field

Medium-high power. At 7mm this is a medium-high-power eyepiece for planets, globular cores and small planetary nebulae; it is not meant for framing large deep-sky objects.

Apparent Field
82°
Barrel Size
1.25"
Eye Relief
15mm
Focal Length
7mm
From$139.95

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Price tracked by PolarisObserved 55 timesTracking since Aug 2026

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The spacewalk

You don’t look at a field.
You look into the sky.

Every number on the spec sheet matters less than one feeling: how much sky wraps around your eye. Widen the apparent field and watch the black edge of the eyepiece slip away.

82° apparent field

At 82°, the edge slips into your peripheral vision, you stop looking at a field and start looking into the sky.
Try this eyepiece on your own scope in the Simulator →
01What it's good at

What it's best at — and the trade-offs.

A true 82-degree field for a fraction of the premium ultra-wides.
Best at
✓A true 82-degree field for a fraction of the premium ultra-wides.
✓A true 82-degree field for a fraction of the premium ultra-wides.
✓At 7mm it lands squarely in medium-high power territory, exactly where planetary and lunar detail lives.
Trade-offs
!Edge astigmatism and some field curvature show up in fast scopes below f/6.
!Heavy, especially the 2-inch long focal lengths.
!A little internal reflection on bright objects like the Moon.
02In your telescope

One eyepiece. A different job in every scope.

69× in a small refractor, 290× in a long SCT

An eyepiece has no magnification of its own — the telescope decides. The same eyepiece becomes 69× and 1.2° of sky in a little refractor, or 290× and a tight frame in a long SCT. Here’s what it does across common scopes.

Small apo refractor
480 mm · f/5.5
Magnification
69×
True field
1.2°
Exit pupil
1.3 mm
69× across a 1.2° field at a 1.3mm exit pupil, crisp medium power for galaxies, clusters and planetary nebulae.
8-inch Dobsonian
1200 mm · f/6
Magnification
171×
True field
29′
Exit pupil
1.2 mm
171× across a 29′ field at a 1.2mm exit pupil, crisp medium power for galaxies, clusters and planetary nebulae.
12-inch Dobsonian
1500 mm · f/5
Magnification
214×
True field
23′
Exit pupil
1.4 mm
214× across a 23′ field at a 1.4mm exit pupil, crisp medium power for galaxies, clusters and planetary nebulae.
8-inch SCT
2032 mm · f/10
Magnification
290×
True field
17′
Exit pupil
0.7 mm
290× across a 17′ field at a 0.7mm exit pupil, high power for planets, the Moon and tight doubles.
Exit pupil is how wide the beam of light leaving the eyepiece is. Around 5–6 mm is bright and immersive under dark skies; push much past 6 mm and you waste light, and under light pollution a smaller exit pupil shows more contrast.
03In plain English

The numbers, in plain English.

7mm FL · 82° AFOV · 1.25"
Focal lengthVery high power
7mm
About 171x in an 8 inch f/5.9 Dobsonian and 290x in an 8 inch SCT. That is high enough to need genuinely steady air, so it is a planetary and double-star eyepiece for the better nights rather than an every-session choice.
Apparent fieldVery wide
82°
An 82 degree field at high power is a practical advantage in an undriven Dobsonian, since the target takes far longer to drift out of view. It also makes high magnification feel less like peering down a tube.
Eye reliefComfortable
15mm
Comfortable for viewing without glasses, and enough to hold a steady eye position during a long planetary session. Spectacle wearers will lose part of the outer field.
BarrelStandard
1.25"
Fits any focuser or diagonal. At 7 mm the field stop needed for 82 degrees fits easily inside the 1.25 inch format, so nothing is being clipped.
OpticsWide-field value
Fully multi-coated
Full multi-coating keeps contrast up across a complex wide-field design. The Luminos line is known for a sharp centre with some edge aberration in fast telescopes, which is the compromise at this price.
04What comes alive

The targets this eyepiece was born for.

Jupiter and its moons, Saturn, The Moon, M13 globular cluster, The Ring and Cat’s Eye…
Jupiter and its moonsComes alive
Jupiter and its moons
Belt detail with room to watch the Galilean moons shift.
SaturnComes alive
Saturn
Rings, the Cassini gap, and Titan in the same field.
The MoonExcellent
The Moon
A high-power tour of rilles, domes and crater chains.
M13 globular clusterExcellent
M13 globular cluster
The core starts to resolve into a spray of suns.
The Ring and Cat’s Eye nebulaeComes alive
The Ring and Cat’s Eye nebulae
Small planetary nebulae take real magnification well.
Excellent
Double stars
Clean, contrasty splits of colorful pairs.
05Role in a collection

Where it sits in your eyepiece case.

Where it sits across 3 focal lengths

A good eyepiece collection isn’t a pile of glass — it’s two or three focal lengths that hand off from wide to tight. This is the anchor at the bottom of the ladder: the one you find and frame with. You buy it once, and it stays your low-power eyepiece for life.

32 mm
Low power · wide field
Find, frame and sweep. Your widest true field and the lowest useful magnification, the eyepiece you reach for first.
Veil Nebula · Pleiades · Milky Way star clouds
13 mm
Medium power · the workhorse
Where most deep-sky objects look their best, galaxies, globulars and planetary nebulae at a comfortable scale.
M13 · Ring Nebula · most galaxies
7 mmThis one
High power · detail
Planets, the Moon at the terminator, tight double stars and the smallest planetary nebulae. Steady-air nights only.
Jupiter · Saturn · lunar craters
06Build around it

What it pairs with.

The telescope · Pair it · Filter it
The telescope
What it goes into
Any 1.25-inch focuser
Fits essentially every telescope made.
Longer focal length scopes reward it
The higher the scope’s focal length, the more planetary scale you get from this eyepiece.
Pair it
What extends its range
A low-power finder eyepiece (~11mm)
Use the long eyepiece to locate and frame, then drop in this one for detail.
Filter it
What transforms the view
A neutral-density Moon filter
Tames the glare of a bright gibbous Moon at high power so detail returns.
07The Polaris Score

How it scores, and why.

81/100
81/ 100
Celestron Luminos 7mm

Judged as a medium-high-power eyepiece for planets, globular cores and small planetary nebulae, it earns its score on a true 82-degree field for a fraction of the premium ultra-wides. The comfortable eye relief lifts it further. It is honest about being a specialist, not an all-rounder.

Optical quality
76
Immersion
93
Comfort
84
Value
78

Polaris weighs how well the eyepiece does the job it was designed for — optics, immersion, comfort and value — never list price or brand.

08Who it's for

An honest fit check.

Observers who want a medium-high-power eyepiece for planets, globular cores and small…
Buy it if you
✓Observers who want a medium-high-power eyepiece for planets, globular cores and small planetary nebulae.
✓Anyone who observes in eyeglasses; the eye relief here is long enough to see the whole field.
✓Deep-sky observers chasing the most immersive, wrap-around field they can get at this price.
Look elsewhere if you
!Anyone chasing the absolute widest field, who should look at a 100-degree eyepiece.
!Grab-and-go observers watching every gram, since this is not the lightest option.
!Anyone hoping to frame large nebulae; that is a job for a low-power eyepiece.
09The numbers

Full specifications.

4 measured and stated values
Optical
Focal Length7mm
Apparent Field82°
Comfort & handling
Eye Relief15mm
Fit & build
Barrel Size1.25"
Editor’s Take

Point it at a planet on a steady night and the case makes itself. This is where the Luminos earns its keep.

— The Skynocular verdict
10Alternatives

For a different goal, start here.

2 alternatives, each mapped to the goal it wins at
Wider, lower power

Celestron Luminos 10mm

The same optics with more true field, for framing larger objects and finding your way around.

→
Cross-shop

Explore Scientific 82°

A natural alternative at a nearby price point, if you want to compare field and feel before committing.

→