Baader Hyperion 5mm — image 1
Baader Planetarium

Baader Hyperion 5mm

A 5mm Baader Hyperion: a dedicated high-power eyepiece for planets, the Moon and tight double stars, from a modular 68-degree workhorse you can rebuild into other focal lengths.

82/ 100
Polaris Score
Optical quality · Immersion · Comfort · Value
See the breakdown ↓
What it's for
Low power · wide fieldHigh power · narrow field

High power. At 5mm this is a dedicated high-power eyepiece for planets, the Moon and tight double stars; it is not meant for framing large deep-sky objects.

Apparent Field
68°
Barrel Size
1.25"
Eye Relief
20mm
Focal Length
5mm
From$217

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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.

68° apparent field

At 68°, the black rim sits out at the corner of your attention rather than in front of you.
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 relaxed 20mm of eye relief that makes long observing sessions genuinely comfortable.
Best at
✓A relaxed 20mm of eye relief that makes long observing sessions genuinely comfortable.
✓A relaxed 20mm of eye relief that makes long observing sessions genuinely comfortable.
✓At 5mm it lands squarely in high power territory, exactly where planetary and lunar detail lives.
Trade-offs
!The outer field softens in fast scopes below about f/6; it is happiest at f/6 and slower.
!Some field curvature means a slight refocus between center and edge on extended objects.
!Heavier and longer than a simple wide-field of the same focal length.
02In your telescope

One eyepiece. A different job in every scope.

96× in a small refractor, 406× in a long SCT

An eyepiece has no magnification of its own — the telescope decides. The same eyepiece becomes 96× and 43′ of sky in a little refractor, or 406× 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
96×
True field
43′
Exit pupil
0.9 mm
96× across a 43′ field at a 0.9mm exit pupil, high power for planets, the Moon and tight doubles.
8-inch Dobsonian
1200 mm · f/6
Magnification
240×
True field
17′
Exit pupil
0.8 mm
240× across a 17′ field at a 0.8mm exit pupil, high power for planets, the Moon and tight doubles.
12-inch Dobsonian
1500 mm · f/5
Magnification
300×
True field
14′
Exit pupil
1.0 mm
300× across a 14′ field at a 1mm exit pupil, high power for planets, the Moon and tight doubles.
8-inch SCT
2032 mm · f/10
Magnification
406×
True field
10′
Exit pupil
0.5 mm
406× across a 10′ field at a 0.5mm exit pupil, very high power, worth it only on the steadiest nights.
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.

5mm FL · 68° AFOV · 1.25"
Focal lengthVery high power
5mm
About 240x in an 8 inch f/5.9 Dobsonian and 406x in an 8 inch SCT. That is beyond what average seeing supports, so this is an eyepiece for the few genuinely steady nights each year, on planets and tight doubles.
Apparent fieldWide
68°
Sixty-eight degrees at very high power is a real practical benefit in an undriven telescope, because it takes far longer for the object to drift out of view than it would in a 50 degree eyepiece.
Eye reliefExcellent
20mm
Twenty millimetres at 5 mm focal length is unusual and valuable: most eyepieces this short force your eye against the glass. You can wear glasses and still see the field, which almost nothing else in this power range allows.
BarrelStandard
1.25"
Fits any focuser or diagonal. The Hyperion body is heavier than a simple eyepiece, so on a light focuser it is worth checking the tension before letting go.
OpticsModular
Baader multi-coatings
Multi-coatings across a complex, many-element design keep contrast respectable, and the modular body accepts fine-tuning rings that change the focal length. Complexity is the trade: an orthoscopic will still beat it on pure planetary contrast.
04What comes alive

The targets this eyepiece was born for.

Jupiter’s cloud belts, Saturn’s rings, Lunar craters at the terminator, Izar and tight…
Jupiter’s cloud beltsComes alive
Jupiter’s cloud belts
The two main belts and festoons resolve on steady nights.
Saturn’s ringsComes alive
Saturn’s rings
The Cassini Division opens up at this magnification.
Lunar craters at the terminatorExcellent
Lunar craters at the terminator
Crater walls and central peaks throw hard shadows.
Excellent
Izar and tight double stars
Splits pairs under an arcsecond apart when the air is calm.
Mars at oppositionExcellent
Mars at opposition
Polar cap and dark albedo markings when Mars is close.
The Ring Nebula (M57)Excellent
The Ring Nebula (M57)
Tightens the smoke ring and darkens the sky around it.
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
5 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 (~8mm)
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.

82/100
82/ 100
Baader Hyperion 5mm

Judged as a dedicated high-power eyepiece for planets, the Moon and tight double stars, it earns its score on a relaxed 20mm of eye relief that makes long observing sessions genuinely comfortable. The comfortable eye relief lifts it further. It is honest about being a specialist, not an all-rounder.

Optical quality
79
Immersion
79
Comfort
94
Value
83

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 dedicated high-power eyepiece for planets, the Moon and tight double…
Buy it if you
✓Observers who want a dedicated high-power eyepiece for planets, the Moon and tight double stars.
✓Anyone who observes in eyeglasses; the eye relief here is long enough to see the whole field.
✓Observers who want a comfortably wide field without paying ultra-wide prices.
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 Length5mm
Apparent Field68°
Comfort & handling
Eye Relief20mm
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 Hyperion 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

Baader Hyperion 8mm

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

→
Cross-shop

Explore Scientific 68°

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

→