SVBony

SVBony SV154 Super Wide Angle 26mm

A 2 inch 70 degree wide field for seventy dollars, where the equivalent from the house brands costs a hundred and ten. The low power eyepiece that turns a Dobsonian into a sweeping instrument.

76/ 100

Polaris Score

Optical quality · Immersion · Comfort · Value

See the breakdown ↓

What it's for

Low power · wide fieldHigh power · narrow field

An ultra low power eyepiece, landing between 18x and 78x depending on the telescope. This is the finding and sweeping end of the range, for large nebulae, open clusters and the objects that will not fit in anything shorter. It is the wrong tool for planets entirely.

Apparent Field

70°

Barrel Size

Eye Relief

20mm

Field Stop

32.3mm

Focal Length

26mm

From$69.99

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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.

See this field in your own scope in the Simulator →

01What it's good at

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

Seventy degrees in a 2 inch barrel for seventy dollars, against a hundred and ten for the closest house brand equivalent in this catalogue at the same…

Best at

✓Seventy degrees in a 2 inch barrel for seventy dollars, against a hundred and ten for the closest house brand equivalent in this catalogue at the same focal length and field.

✓In an eight inch Dobsonian it frames a degree and a half, which is enough to hold the Double Cluster, the Veil segments and the larger open clusters whole.

✓Twenty millimetres of eye relief with a fold down eyecup makes it comfortable with or without glasses, which is not a given in budget wide field eyepieces.

Trade-offs

!A five element super wide design is not a flat field design. In an f/5 telescope stars in the outer twenty percent of the field show visible astigmatism, and at f/4 it is worse.

!At 305 grams it is heavy, and in a small Dobsonian or a short refractor it can shift the balance enough to need the tension adjusting.

!Requires a 2 inch focuser. There is no 1.25 inch version of this focal length and field, so a 1.25 inch only telescope cannot use it at all.

02In your telescope

One eyepiece. A different job in every scope.

18× in a small refractor, 78× in a long SCT

An eyepiece has no magnification of its own — the telescope decides. The same eyepiece becomes 18× and 3.9° of sky in a little refractor, or 78× 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

18×

True field

3.9°

Exit pupil

4.7 mm

In a 480mm apo this yields 18x over 3.9 degrees with a 4.7mm exit pupil, a true rich field view that frames the largest clusters and the Milky Way starfields whole.

8-inch Dobsonian

1200 mm · f/6

Magnification

46×

True field

1.5°

Exit pupil

4.3 mm

In an eight inch Dobsonian it gives 46x across a degree and a half, which is the setting that makes star hopping easy and holds objects like the Double Cluster in a single view.

12-inch Dobsonian

1500 mm · f/5

Magnification

58×

True field

1.2°

Exit pupil

5.2 mm

In a twelve inch Dobsonian it reaches 58x with a 5.2mm exit pupil, the maximum light this eyepiece can deliver, though at f/5 the outer field softens noticeably.

8-inch SCT

2032 mm · f/10

Magnification

78×

True field

54′

Exit pupil

2.6 mm

In an eight inch Schmidt-Cassegrain it produces 78x over 54 arcminutes, which turns a long focal length telescope into something that can finally frame a large object.

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.

26mm FL · 70° AFOV · 2"

Apparent fieldVery wide

70°

This is the width of the view as it appears to your eye, and 70 degrees is past the point where you stop being aware of the edge and start feeling like you are looking through an open window. Paired with a long focal length it is what makes low power sweeping enjoyable rather than merely useful.

Focal lengthUltra low power

26 mm

Divided into your telescope, this gives 18x in a small apo, 46x in an eight inch Dobsonian and 78x in an eight inch Schmidt-Cassegrain. Those are finding and framing powers. The point of this eyepiece is not to magnify but to show you a large piece of sky at a scale where faint extended objects are bright enough to see.

Barrel sizeRequires a 2 inch focuser

2 inch

This is the specification to check before anything else. A 70 degree field at 26mm needs a field stop of 32 millimetres, which physically cannot pass through a 1.25 inch barrel. If your telescope has a 1.25 inch focuser, this eyepiece will not fit and no adapter can change that.

Exit pupil rangeWide

2.6 to 5.2 mm

Exit pupil is the width of the beam of light leaving the eyepiece, and it must be smaller than your own dark adapted pupil or you waste aperture. Four to five millimetres is the classic deep sky setting: it delivers the maximum amount of light your eye can accept, which is exactly what a faint nebula needs. Observers over about fifty, whose pupils no longer open past five millimetres, should note the 5.2mm figure in a fast Dobsonian.

Optical designWide, not flat

5 elements in 3 groups

This is a super wide angle design rather than a flat field one, and the distinction matters in fast telescopes. Five elements deliver the wide field affordably and do not fully flatten it, so at f/5 the outer stars take on a small wedge shape. In an f/6 or slower telescope the effect is minor. At f/4 it is the reason people spend three times more.

04What comes alive

The targets this eyepiece was born for.

The Pleiades (M45), The Double Cluster, The Veil Nebula, The Andromeda Galaxy (M31), The…

Comes alive

The Pleiades (M45)

Frames whole with dark sky around it, which is the only way this cluster looks right.

Comes alive

The Double Cluster

Both halves in one field at 46x, which shorter eyepieces simply cannot do.

Comes alive

The Veil Nebula

With an OIII filter this is the focal length that shows the whole eastern arc draped across the field.

Excellent

The Andromeda Galaxy (M31)

The core, the dust lanes and both companions in one view at low power under a dark sky.

Excellent

The Orion Nebula (M42)

Shows the full extent of the wings and the surrounding nebulosity rather than just the bright core.

Comes alive

The Beehive Cluster (M44)

A large scattered cluster that needs exactly this much field to look like a cluster at all.

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.

26 mmThis one

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 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

Where this focal length works

An eight inch Dobsonian with a 2 inch focuser

46x over a degree and a half turns a hunting instrument into a sweeping one, and f/6 is slow enough to keep the edge respectable.

An eight inch Schmidt-Cassegrain

At 2032mm this is the only way to get a field approaching a degree, which a long focal length telescope otherwise cannot reach.

Pair it

What to own alongside

SVBony SV190 Ultra Flat Field 18mm

The next step up in power, and a flat field design for the nights when the edge of this one bothers you.

A 2 inch star diagonal

Refractor and Schmidt-Cassegrain owners will need one. A 1.25 inch diagonal defeats the whole point of a 2 inch eyepiece.

Filter it

What helps at this power

An OIII filter, 2 inch

This pairing is the reason to own both. At 46x with an OIII the Veil goes from invisible to unmistakable.

SVBony UHC

Broader than an OIII and more forgiving, it lifts the large emission nebulae out of suburban sky at exactly this focal length.

07The Polaris Score

How it scores, and why.

76/100

76/ 100

SVBony SV154 Super Wide Angle 26mm

As a low power wide field it does the job it exists for and undercuts the equivalent house brand by a meaningful margin. It loses ground on edge correction in genuinely fast telescopes, which is the known weakness of five element super wide designs and the reason the premium wide fields still command their price.

Optical quality

Immersion

Comfort

Value

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.

Dobsonian owners who want a genuine low power sweeping eyepiece and have a 2 inch focuser…

Buy it if you

✓Dobsonian owners who want a genuine low power sweeping eyepiece and have a 2 inch focuser sitting unused.

✓Observers under dark skies chasing the large faint objects, where a 4 to 5mm exit pupil puts the most light into the eye.

✓5 degree field in an eight inch scope makes finding things dramatically easier.

✓Glasses wearers, since 20 millimetres of eye relief and a fold down cup clear most prescriptions.

Look elsewhere if you

!25 inch only focusers, which cannot physically take this eyepiece.

!Planetary observers, for whom 46x in an eight inch scope is a finder power and nothing more.

!Observers with very fast telescopes at f/4, where a five element super wide design shows visible astigmatism in the outer field and a premium design genuinely earns its money.

!Anyone with a small mount already close to its limit, because 305 grams hanging off the back of a short refractor changes the balance.

09The numbers

Full specifications.

8 measured and stated values

Optical

Focal Length26mm

Apparent Field70°

Field Stop32.3mm

CoatingsFully multi-coated

Comfort & handling

Eye Relief20mm

Fit & build

Barrel Size2"

More

lens design5 elements in 3 groups

weight g305

Editor’s Take

Low power is the setting people underrate and then use most. Very few objects in the sky reward maximum magnification, and a great many of them are too large to fit in anything but a 2 inch eyepiece. What this focal length buys is not detail, it is context: the Veil draped across the field with room to spare, the Double Cluster sitting in the same view, a Dobsonian that suddenly sweeps instead of hunting. That it costs seventy dollars rather than the hundred and ten its direct equivalent asks is the sort of thing worth knowing before you buy the other one.

— The Skynocular verdict

10Alternatives

For a different goal, start here.

3 alternatives, each mapped to the goal it wins at

The direct comparison

Apertura Super Wide Angle 26mm

The same 26mm and 70 degrees in a 2 inch barrel at around a hundred and ten dollars, better finished and optically very close.

→The wider field

GSO SuperView 30mm 2-inch

Longer focal length and 68 degrees for a wider true field, at a similar price with the same fast scope caveats.

→The step up in correction

SVBony SV190 Ultra Flat Field 18mm

Less field and less magnification, but a genuinely flat field that holds together in fast telescopes where this one does not.

→

SVBony SV154 Super Wide Angle 26mm

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

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

One eyepiece. A different job in every scope.

The numbers, in plain English.

The targets this eyepiece was born for.

Where it sits in your eyepiece case.

What it pairs with.

How it scores, and why.

An honest fit check.

Full specifications.

For a different goal, start here.

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