Sky-Watcher

Sky-Watcher Skymax 150 mm Maksutov-Cassegrain Telescope OTA

Name: Sky-Watcher Skymax 150 mm Maksutov-Cassegrain Telescope OTA
Brand: Sky-Watcher

A 6-inch Maksutov built for the Moon and planets, long f/12 focal length and pinpoint, high-contrast optics in a compact sealed tube. The specialist for lunar and planetary detail.

85/ 100

Polaris Score

#1 of 4 planetary Maksutovs

See the breakdown ↓

Aperture

150mm

Focal Length

1800mm

Focal Ratio

f/12

Mount Type

None (OTA only)

Optical Design

Maksutov-Cassegrain

Weight

6.8 kg

From$975

$156 above 90-day lowLast $819 in Jul 2026

Price tracked by PolarisObserved 97 timesTracking since Jul 2026

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Where to buy

Agena AstroProductsPartnerBest price$975→Sky-Watcher USA$975→Astronomics$975→Starizona$975→High Point Scientific$975→

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What it's built forOpen these in the simulator →

This telescope lives for the planets.

An f/12 focal length built to magnify. Where fast scopes sweep wide, this one holds a single planet rock-steady at high power — a telescope for the patient observer on a steady night.

Sweet spot 110–190×Loves steady seeing

The view people remember

Saturn, with its rings tilted wide.

The one you call people outside to see — the rings standing clear of the planet, the Cassini Division a clean black line drawn around them.

See Saturn through this telescope →

Where else it shines

Never gets old

The Moon

Crisp crater rims and fine surface texture, ridges visible inside maria

Open view →

Also excellent on

Jupiter

Atmospheric bands or polar caps visible depending on the planet

Open view →

Within reach

Orion Nebula

Stronger structure — embedded stars plus dark lanes within the core

Open view →

Easy first target

The Pleiades

Rich field — fainter members fill out the cluster

Open view →

✦

Wide-field nebulae belong to another kind of telescope. This one trades width for reach.

01What it's good at

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

150mm of aperture at f/12 delivers high magnification and crisp, high-contrast planetary and lunar detail.

Best at

✓150mm of aperture at f/12 delivers high magnification and crisp, high-contrast planetary and lunar detail.

✓The sealed Maksutov design needs no collimation and holds its alignment for years.

✓A long focal length in a short, compact tube, far more portable than a refractor of the same reach.

✓Excellent on double stars and the brighter planetary nebulae as well as the Moon and planets.

Trade-offs

!Slow f/12 and long focal length make it poorly suited to deep-sky imaging.

!A narrow field cannot frame large objects like the Pleiades or big nebulae.

!The sealed tube takes real time to cool for its sharpest views.

!OTA only; it needs a solid mount, ideally with tracking for high-power planetary work.

02In plain English

What These Numbers Mean

150mm · f/12 · 1800mm FL

Aperture

150 mm (6 inch)

Six inches gathers about 460 times the light of your eye, which is large for a Maksutov. It resolves close double stars, shows fine detail on Jupiter and Mars, and brings the brighter globular clusters within reach.

Focal length

1800 mm

Long. It reaches 360x with a 5 mm eyepiece, which the aperture can genuinely support on steady nights. The narrow field means a 32 mm eyepiece still only gives 56x, so this is not a scope for sweeping the Milky Way.

Focal ratio

f/12

Slow by design, which is what delivers the high-contrast planetary images. It also means faint extended objects look dim and imaging deep sky is impractical without a reducer.

Optical design

Maksutov-Cassegrain

A sealed tube with a thick meniscus corrector, no collimation to maintain, and a small central obstruction that preserves contrast. It is the design planetary specialists choose when a refractor of the same aperture would be impractically long and costly.

Weight

6.8 kg tube

About 15 lb in a short tube, so it lifts easily onto a mount. The compact shape means a mid-size alt-azimuth or equatorial handles it well.

Cooldown

60 to 90 minutes

A six-inch meniscus is a large mass of glass and it cools slowly. Until the tube reaches ambient temperature the planetary views stay soft, so plan setup an hour ahead or fit a cooling fan.

03The Polaris Score

How it scores, and why.

85/100 · #1 of 4 planetary Maksutovs

85/ 100

Sky-Watcher Skymax 150 mm Maksutov-Cassegrain Telescope OTA

#1 of 4 planetary Maksutovs

Performance

Ease of use

Portability

Upgrade potential

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