William Optics FLT 132 FluoroStar APO — image 1
William Optics

William Optics FLT 132 FluoroStar APO

William Optics' 132mm FluoroStar triplet, an FPL-53 apo that pushes their premium line to large aperture with strong visual and imaging performance below the Japanese flagships.

90/ 100
Polaris Score
#2 of 5 large triplet apo
See the breakdown ↓
Aperture
132mm
Focal Length
924mm
Focal Ratio
f/7
Mount Type
None (OTA only)
Optical Design
Triplet APO
Weight
7.3 kg
From$4,798

Out of stock at Agena AstroProducts, its only retailer — this is the last price we saw. We keep checking daily.

Price tracked by PolarisObserved 96 timesTracking since Jul 2026

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Where to buy

Verified 13h ago · prices tracked daily

What it's built forOpen these in the simulator →

This telescope was built for sweeping wide.

A short, fast refractor with a generous true field — the whole sword of Orion in one view, star fields that spill past the field stop. It rewards low power and dark skies far more than chasing magnification.

Widest true fieldsTack-sharp to the edge
The view people remember

The Double Cluster, side by side.

Two glittering knots of stars sharing one low-power field — a wide, effortless showpiece that rewards the biggest true field you can throw at it.

See Double Cluster through this telescope →
01What it's good at

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

The FPL-53 air-spaced triplet controls colour extremely well, so bright objects stay clean at high power
Best at
✓The FPL-53 air-spaced triplet controls colour extremely well, so bright objects stay clean at high power
✓132mm at f/7 balances high-resolution visual work with a focal length that frames deep-sky targets
✓William Optics build quality, focuser and finish are excellent at this price
✓It scales from native visual use to flat, fast imaging with the matched flattener or reducer
Trade-offs
!The tube is heavy and needs a genuinely stable mount
!A matched flattener or reducer is a separate purchase for imaging
!It is an OTA only and needs a mount, diagonal and eyepieces
!It takes longer to cool than a smaller apo
02In plain English

What These Numbers Mean

132mm · f/7 · 924mm FL
Aperture
132 mm
Over five inches of premium apochromatic glass. It gathers about 21 percent more light than a 120 mm and has the resolving power for tight double stars and fine planetary detail, alongside serious deep-sky imaging capability.
Focal length
924 mm
Long enough to frame galaxies, globular clusters and planetary nebulae with real scale, and to reach 185x with a 5 mm eyepiece. Wide nebulae need the reducer or a shorter telescope.
Focal ratio
f/7
Moderate speed that supports the design's colour correction while keeping imaging exposures practical with a flattener. A sensible balance between visual quality and photographic use.
Optical design
FPL-53 triplet apochromat
Three elements with premium ED glass produce essentially colour-free images, so bright stars stay clean at high power and blue channels stay sharp when imaging. The mass of glass means a genuine cooldown period.
Weight
7.3 kg tube
About 16 lb of long tube before rings, camera and guiding. That is a deliberate lift and it needs a substantial mount to stay steady at high magnification.
Mount
OTA only
No mount included. Plan on an equatorial in the 20 kg class for imaging, or a heavy alt-azimuth for visual use, so the mount is not the limiting factor.
03The Polaris Score

How it scores, and why.

90/100 · #2 of 5 large triplet apo
90/ 100
William Optics FLT 132 FluoroStar APO
#2 of 5 large triplet apo
Performance
94
Ease of use
65
Portability
50
Upgrade potential
85

Polaris weighs optical capability, how easy the scope is to live with, how portable it is, and how far it takes you before you outgrow it — not list price or brand.

04Who it's for

An honest fit check.

Observers who want a large, high-quality apo for planets, doubles and deep sky
Buy it if you
✓Observers who want a large, high-quality apo for planets, doubles and deep sky
✓Imagers wanting a versatile triplet that scales with accessories
✓People who want premium character below the top-brand price
Look elsewhere if you
!Grab-and-go users, since a 132mm triplet is heavy and needs a solid mount
!Budget buyers, since it costs well over a doublet of the same aperture
!Anyone who needs a complete package, since this is an OTA only
05Build your rig

What to buy next — and where it leads.

6 pieces of gear, ordered by what changes the view most
Recommended upgrades
A sharper everyday view★ Top pickTele Vue Nagler 22mm Type 4

A premium 82-degree eyepiece for immersive wide-field views

Observe all night, no AA batteriesTele Vue 2.5x Powermate

Clean high-power reach for planetary and double-star detail

No fogging on long sessionsPegasus Astro Multi-Channel Dew Controller

Protects the front triplet from dew on long nights

Growth path
Portable astrophotographyZWO AM5N Harmonic Equatorial Mount✓ Compatible

Start capturing images of the Moon and planets

Permanent-setup astrophotographySky-Watcher EQ6-R Pro✓ Compatible

Commonly paired with this telescope

Start imagingZWO ASI2600MC Pro

Start capturing images of the Moon and planets

Lunar & planetary
Excellent contrast
Deep-sky imaging
Strong with a flattener
Deep-sky visual
Strong
06The numbers

Full specifications.

6 measured and stated values
Optics
Optical DesignTriplet APO
Aperture132mm
Focal Length924mm
Focal Ratiof/7
Mount & drive
Mount TypeNone (OTA only)
Physical
Weight7.3 kg
07Alternatives

For a different goal, start here.

3 alternatives, each mapped to the goal it wins at
Step up in class

Takahashi TOA-130NFB

Takahashi's flagship triplet if you want the ultimate refractor optics

→
More aperture for less

Askar 140APO Triplet Refractor

A 140mm triplet at a lower price if brand matters less

→
Smaller sibling

William Optics FLT120 FluoroStar APO

The 120mm FLT if you want a lighter, more affordable tube in the same line

→
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