Takahashi TOA-150B — image 1
Takahashi

Takahashi TOA-150B

Takahashi's 6-inch flagship refractor, a double-ED ortho-apochromat triplet that sits at the very top of what a refractor can do for both demanding visual and imaging work.

94/ 100
Polaris Score
#1 of 4 flagship apo refractor
See the breakdown ↓
Aperture
150mm
Focal Length
1100mm
Focal Ratio
f/7.3
Mount Type
None (OTA only)
Optical Design
Triplet APO
Weight
10.4 kg
From$13,070

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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 Orion Nebula, wings unfolded.

The four stars of the Trapezium sit inside folded sheets of glowing gas — the closest stellar nursery to us, bright enough to show real structure even from the suburbs.

See Orion Nebula through this telescope →
01What it's good at

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

The double-ED triplet corrects colour and spherical aberration to a standard almost nothing else reaches
Best at
✓The double-ED triplet corrects colour and spherical aberration to a standard almost nothing else reaches
✓150mm of aperture delivers stunning high-power views of the planets and the resolution to split the tightest doubles
✓It is a superb long-focal-length imaging platform for galaxies and smaller nebulae
✓The build, focuser and mechanical stability are the reference for a large refractor
Trade-offs
!The price is extreme and only justified for the most demanding users
!At 12kg it needs a large, expensive mount to carry and track it well
!It is an OTA only, adding mount, diagonal and eyepiece costs on top
!The long, heavy tube makes it a deliberate, planned setup
02In plain English

What These Numbers Mean

150mm · f/7.3 · 1100mm FL
Aperture
150 mm
Six inches of reference-grade refractor glass, which is about as large as apochromats get before cost becomes prohibitive. It gathers roughly 33 percent more light than a 130 mm and resolves detail limited by the atmosphere rather than by the optics.
Focal length
1100 mm
Long enough to reach 220x with a 5 mm eyepiece and to frame globular clusters, planetary nebulae and galaxies with real scale. With the dedicated flattener it produces some of the cleanest wide-field images available at this focal length.
Focal ratio
f/7.3
Moderate speed, chosen to support the design's extreme correction rather than to shorten exposures. Imaging with it is a patient discipline; the reward is star fields with essentially no aberration anywhere in frame.
Optical design
Ortho-apochromatic triplet
Three elements corrected for both chromatic and spherical aberration to a standard few manufacturers attempt. It is the reason this telescope is used as a benchmark for what a refractor can do.
Weight
12 kg tube
About 26 lb of long, dense tube. Mounting it is a deliberate two-hands operation and it realistically lives on a pier or a heavy tripod rather than moving between sites.
Mount
OTA only
You supply the mount, and it must be substantial. Anything less than a heavy equatorial will vibrate long enough to waste the resolution the optics provide.
03The Polaris Score

How it scores, and why.

94/100 · #1 of 4 flagship apo refractor
94/ 100
Takahashi TOA-150B
#1 of 4 flagship apo refractor
Performance
98
Ease of use
60
Portability
35
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.

Serious observers and imagers who want the finest refractor optics made
Buy it if you
✓Serious observers and imagers who want the finest refractor optics made
✓People making a once-in-a-lifetime premium purchase
✓Those with a large, high-capacity mount already in place
Look elsewhere if you
!Anyone on a budget, since this is among the most expensive apos per inch
!Grab-and-go users, since a 6-inch triplet is very heavy and long
!Beginners who would not exploit its capabilities
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 pickEthos 13mm

85x on the 1100mm focal length with a 100° field — the immersive deep-sky view this apo was built to feed

A sharper everyday viewTele Vue Nagler 22mm Type 4

50x wide-field for star fields and larger nebulae, holding sharp to the edge on a fast triplet

Observe all night, no AA batteriesTele Vue 2.5x Powermate

pushes to 2750mm for high-resolution lunar, planetary and double-star work the 150mm aperture resolves

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
Aperture150mm
Focal Length1100mm
Focal Ratiof/7.3
Mount & drive
Mount TypeNone (OTA only)
Physical
Weight10.4 kg
07Alternatives

For a different goal, start here.

3 alternatives, each mapped to the goal it wins at
Lighter and cheaper

Takahashi TOA-130NFB

The 130mm flagship triplet if the 150 is more scope, weight and cost than you need

→
More aperture for less

Sky-Watcher Evostar 150 APO Refractor

A 6-inch ED doublet at a fraction of the price if you prize aperture over the last measure of correction

→
Value triplet

Askar 140APO Triplet Refractor

A 140mm triplet that delivers most of the quality for far less

→
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