Sky-Watcher Starlux 190 190mm Maksutov-Newtonian f/5.3 optical tube


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The Sky-Watcher f/5.3 190mm Maksutov-Newtonian optical system is a quality fast focal ratio performer that excels at deep space imaging and viewing.

Our Product #: S11550
Sky-Watcher Product #: S11550
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Product Description

The exciting 7.5" f/5.3 Mak-Newt from Sky-Watcher is just what astrophotographers and serious deep space visual observers have been looking for. It uses a hybrid optical system that combines a Newtonian reflector's parabolic primary mirror with a Maksutov's spherical front corrector. The result is a system that corrects for both coma and spherical and chromatic aberrations.

The Maksutov-Newtonian design provides large aperture/fast focal ratio apochromatic performance similar to that of a fine refractor with exceptional field correction in a compact and affordable package. The small secondary obstruction yields a sharper and higher contrast image than a Schmidt-Cassegrain - both visually and photographically. The fast f/5.3 focal ratio makes the Sky-Watcher Mak-Newt an excellent wide field photographic instrument for deep sky imaging.

The optical tube is made of rolled steel, powder-coated gloss black, with gold fleck accents. The front and rear cells are painted die-cast aluminum. The front cell is perforated to allow faster cool down of the Maksutov corrector. A precision 2" Crayford focuser is standard. The smooth backlash-free focuser has both coarse and ultra-fine (10:1 ratio) focusing knobs.

Features of this 180mm Sky-Watcher Maksutov-Cassegrain . . .

Maksutov-Newtonian optics: 7.5" (190mm) aperture, 1000mm focal length, f/5.3. The optical system uses Pyrex mirrors (a parabolic primary and a diagonal flat). The parabolic primary mirror helps correct for spherical aberration. The diagonal mirror is attached directly to the Maksutov corrector, instead of being supported by a traditional Newtonian reflector's spider vanes. This eliminates the diffraction spikes typical of spider vanes to improve contrast. The Maksutov spherical corrector lens is made of premium Schott crown optical glass and is fully multi-coated on both sides with multiple layers of anti-reflection materials for high light transmission and good contrast. Internal baffling reduces stray light to further improve the contrast.

Focuser: Dual-speed 2" Crayford type with 10:1 ratio fine focusing.

2" eyepiece: The 36x eyepiece is a fully multi-coated three-element Sky-Watcher 28mm LET design with a long 20mm eye relief and a twist-up eyecup. The eyepiece field of view is 1.55° across, a little larger than three lunar diameters, for expansive views of nebulas, open and globular star clusters, and galaxies.

Finder: 9 x 50mm right-angle correct image dark crosshair achromatic refractor.

Mounting rings and dovetail: Dual split tube rings are attached to a Vixen-style dovetail bar for installing the scope on any altazimuth or equatorial mount that uses a Vixen-style saddle. The split rings let you adjust the rotation and fore and aft position of the scope relative to the mount for balancing the scope and adjusting the focuser to the most comfortable viewing and imaging position. A 1/4"-20 thread stud on the top of one of the tube rings lets you piggyback a camera onto the scope for wide-field photography.

Warranty: two years.

Tech Details

Aperture 7.5"
Focal Length 1000mm
Focal Ratio f/5.3
Highest Useful Magnification 333x
Weight 29 lbs.
Resolution 0.61 arc seconds
Visual Limiting Magnitude 13.9
Warranty 2 years


Review by:
I've used it extensively with 2 DSLRs, one a full-frame unmodded Canon 6D, the other an APS/C modded Canon T1i. It is pretty much sharp to edge of frame on both cameras, but even with the 63mm secondary on the current version (which I have), it vignettes some on the full-frame chip. I found the stock focuser fine after adjusting the focuser tension. It holds the weight of both cameras easily and focuses smoothly (at least on mine). It provides excellent images visually. The secondary obstruction percentage is about the same as a C8. As a result, the planetary and lunar views are about the same as a very well corrected C8, which I've had one or two of over the years. Additionally, I find that removing the rear mirror cover, the ventilation provided by the from vent holes allows fast cooling compared to the Intes and Intes-Micro Mak-Newts I've owned in the past. The scope would have better planetary contrast, but the scope really is designed for the imager. A heavier camera will benefit from a replacement focuser, but for my needs with a DSLR, it works beautifully as it comes from Skywatcher. Only addition I made to it was a flexible dewshield for dew prevention. I've been getting away with it on a Celestron AVX, since the weight of the corrector in the front seems to balance the mirror in rear, but I know others have found the need for a larger mount. Using a ZWO planetary camera as a guidescope with a 9x50 finder as the guidescope, I have no problems imaging with perfect, round stars. Overall, I'm very impressed with the performance and quality of this telescope. I recommend it, but despite my success with my AVX, I would recommend an EQ6 or larger mount for best success with it. (Posted on 9/20/2021)
Review by:
I have a two-year old Skywatcher MN190, 4/5.3 Mak-Newt, which may have been a predecessor model to the"Starlux." Specifications look the same however my comments are on the 2015 vintage scope. The scope, for me, is portable as long as I'm carrying short distances from car or garage to setup. For imaging, stars are acceptably sharp to the edge of the field, using a Canon 450 DSLR. I would be happy with the stock focuser for visual but found it a bit touchy for imaging. Therefore upgraded to a Moonlight focuser after a couple years. (Posted on 11/18/2018)
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