Sky-Watcher Skymax 90 90mm f/13.9 Maksutov-Cassegrain optical tube


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The Sky-Watcher 90mm Maksutov-Cassegrain is a compact optical powerhouse, capable of producing sharp, high contrast images inside the solar system and out.
Our Product #: S11500
Sky-Watcher Product #: S11500
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Product Description

Like all Maksutov-Cassegrain telescopes, such as the ultra-premium Questars, this 90mm (3.5") Sky-Watcher is designed for observing anything that is small and distant and needs substantial power to resolve clearly. Its Maksutov-Cassegrain folded optical system provides sharp, high contrast images - mountains and craters on the Moon; major surface details on Mars; multiple storm bands on Jupiter; even Cassini's Division in the rings of Saturn occasionally pops into view in good seeing conditions.

Outside the solar system, the high resolution 90mm Sky-Watcher splits close binary stars, resolves open star clusters, begins to reveal the brighter nebulas and galaxies, and more. It can also be used as a very high performance terrestrial spotting scope.

Features of this 90mm Sky-Watcher Maksutov-Cassegrain . . .

Maksutov-Cassegrain optics: 3.54" (90mm) aperture, 1250mm focal length, f/13.8 optical system. The system's Maksutov corrector lens is fully multi-coated on both sides with multiple layers of anti-reflection materials for high light transmission and good contrast.

Internal focuser: Focuses by moving the primary mirror fore and aft in the optical tube by means of a large focusing knob on the rear cell.

Star diagonal: 1.25" 90°.

Two 1.25" eyepieces: The first is a 25mm Plössl providing 50x. The eyepiece field of view is 1° across, twice the diameter of the full Moon, for expansive views of the Moon, star clusters, and terrestrial observing. The second is a 10mm Plössl providing 125x for close-up views of the Moon and planets, globular star clusters, binary stars and more.

Finder: illuminated red dot finder. The red dot finder is a quick and easy way to point your telescope exactly to the desired object in the sky. There's no need to worry about the inverted images you see through traditional finders. Just align the red dot seen in the finder with the desired object and you're done.

Dovetail: Vixen-style dovetail bar for installing the scope on any altazimuth or equatorial mount using a Vixen-style dovetail.

Warranty: two years.

Tech Details

Aperture 3.5"
Focal Length 1250mm
Focal Ratio f/13.9
Highest Useful Magnification 179x
Weight 5 lbs.
Resolution 1.29 arc seconds
Visual Limiting Magnitude 12.3
Warranty 2 years


Review by:
If you're looking for a small portable Mak, the 90mm is the way to go. Whether a grab 'n go, extra, second scope or wanting to see what using a Mak is like, this is the scope to get. Comes with an RDF finder which is easier to use on a small Mak than those that come with that tiny refractor finder... (Posted on 9/9/2019)
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