Apertura Super Wide Angle 15mm — image 1
Apertura

Apertura Super Wide Angle 15mm

A 15mm Apertura Super Wide Angle: the workhorse magnification where most galaxies, globulars and nebulae look their best, from a budget 70-degree wide-field, a big step up from a kit Plössl for little money.

77/ 100
Polaris Score
Optical quality · Immersion · Comfort · Value
See the breakdown ↓
What it's for
Low power · wide fieldHigh power · narrow field

Medium power. At 15mm this is the workhorse magnification where most galaxies, globulars and nebulae look their best.

Apparent Field
70°
Barrel Size
1.25"
Eye Relief
14mm
Focal Length
15mm
From$69.95

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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 70°, 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.

Inexpensive enough to fill out a focal-length range cheaply.
Best at
✓Inexpensive enough to fill out a focal-length range cheaply.
✓A 70-degree field that feels wide open after a kit eyepiece.
✓At 15mm it lands squarely in medium power territory, exactly where most deep-sky objects look their best.
Trade-offs
!Eye relief is tight at the short focal lengths.
!The edge of the field softens in fast scopes.
!Basic build compared with premium wide-fields.
02In your telescope

One eyepiece. A different job in every scope.

32× in a small refractor, 135× in a long SCT

An eyepiece has no magnification of its own — the telescope decides. The same eyepiece becomes 32× and 2.2° of sky in a little refractor, or 135× 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
32×
True field
2.2°
Exit pupil
2.7 mm
32× across a 2.2° field at a 2.7mm exit pupil, right in the deep-sky sweet spot, bright and easy on the eye.
8-inch Dobsonian
1200 mm · f/6
Magnification
80×
True field
53′
Exit pupil
2.5 mm
80× across a 53′ field at a 2.5mm exit pupil, right in the deep-sky sweet spot, bright and easy on the eye.
12-inch Dobsonian
1500 mm · f/5
Magnification
100×
True field
42′
Exit pupil
3.0 mm
100× across a 42′ field at a 3mm exit pupil, right in the deep-sky sweet spot, bright and easy on the eye.
8-inch SCT
2032 mm · f/10
Magnification
135×
True field
31′
Exit pupil
1.5 mm
135× across a 31′ field at a 1.5mm exit pupil, crisp medium power for galaxies, clusters and planetary nebulae.
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.

15mm FL · 70° AFOV · 1.25"
Focal lengthMid power
15mm
About 80x in an 8 inch f/5.9 Dobsonian and 135x in an 8 inch SCT. A general-purpose magnification that suits globular clusters, brighter galaxies and the larger planetary nebulae.
Apparent fieldWide
70°
A 70 degree field gives a comfortably wide view without demanding the optical correction that extreme wide fields require. In a fast Dobsonian this is the sweet spot between immersion and edge quality at this price.
Eye reliefReasonable
14mm
Fourteen millimetres is enough for relaxed viewing without glasses and marginal with them. It is a noticeable improvement over the shorter focal lengths in this same series.
BarrelStandard
1.25"
The standard size found on every telescope, so it drops into any focuser or diagonal without adapters and keeps the eyepiece light enough not to unbalance a Dobsonian.
OpticsBudget wide-field
Multi-coated
Coatings across the surfaces keep contrast reasonable through a multi-element wide-field design. Centre sharpness is good; the outer field softens at f/5 and below, which is the trade for the price.
04What comes alive

The targets this eyepiece was born for.

M13 globular cluster, The Whirlpool (M51), The Dumbbell Nebula (M27), M81 and M82, The Ring…
M13 globular clusterComes alive
M13 globular cluster
Resolves to the core with pinpoint stars across the field.
The Whirlpool (M51)Excellent
The Whirlpool (M51)
Two cores and a hint of the bridging spiral arm.
The Dumbbell Nebula (M27)Comes alive
The Dumbbell Nebula (M27)
The apple-core shape framed with dark sky around it.
M81 and M82Excellent
M81 and M82
Both galaxies in one field, one soft, one edge-on and streaky.
The Ring Nebula (M57)Excellent
The Ring Nebula (M57)
A clean smoke ring at a comfortable scale.
The Trapezium in OrionExcellent
The Trapezium in Orion
Four stars split cleanly inside the glowing nebula.
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
15 mmThis one
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 mm
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.
Fast, short scopes love this field
A fast Newtonian or refractor turns this focal length into a rich, wide sweep.
Pair it
What extends its range
A high-power eyepiece (~9mm)
Locate and frame with this one, then swap to high power for planets and small objects.
Filter it
What transforms the view
A mild broadband light-pollution filter
Lifts contrast on galaxies and clusters from the suburbs at medium power.
07The Polaris Score

How it scores, and why.

77/100
77/ 100
Apertura Super Wide Angle 15mm

Judged as the workhorse magnification where most galaxies, globulars and nebulae look their best, it earns its score on a 70-degree field that feels wide open after a kit eyepiece. Tighter eye relief at this focal length is the main thing holding it back. It is honest about being a specialist, not an all-rounder.

Optical quality
72
Immersion
82
Comfort
76
Value
84

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 the workhorse magnification where most galaxies, globulars and nebulae…
Buy it if you
✓Observers who want the workhorse magnification where most galaxies, globulars and nebulae look their best.
✓Observers happy to take their glasses off at the eyepiece.
✓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.
!Eyeglass wearers, who will not comfortably reach the full field at this focal length.
!Planetary specialists who want the last ounce of high-power contrast from an orthoscopic.
09The numbers

Full specifications.

4 measured and stated values
Optical
Focal Length15mm
Apparent Field70°
Comfort & handling
Eye Relief14mm
Fit & build
Barrel Size1.25"
Editor’s Take

Sweep it across a rich star field and the reason to own this focal length is obvious in a second. That is what the Super Wide Angle is for.

— The Skynocular verdict
10Alternatives

For a different goal, start here.

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

Apertura Super Wide Angle 26mm

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

→
More magnification

Apertura Super Wide Angle 10mm

The same line at higher power, for planets and the smallest deep-sky detail.

→
Cross-shop

Explore Scientific 68°

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

→