Sky-Watcher Starlux 190MN
- 190mm Maksutov-Newtonian Optical Design
- 1000mm Focal Length
- Fast f/5.3 Focal Ratio
- Radiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity
- 2" Dual-Speed Crayford Focuser
- Weighs 29 lbs with accessories
The Sky-Watcher Starlux 190MN delivers apochromatic-level performance in a high-throughput design, combining a 203mm primary mirror, a 1000mm focal length, and a fast f/5.3 focal ratio. Its integrated Maksutov corrector lens eliminates the need for additional flatteners, providing pinpoint stars across a wide, flat field, while the Radiant Aluminum Quartz (RAQ)™ mirror coatings ensure 94% reflectivity for maximum brightness on faint deep-sky targets. With a secondary obstruction of just 34% by diameter, the Starlux 190MN maintains the high-contrast views critical for resolving fine planetary and nebular detail.
The Starlux 190MN's optical design provides a coma-free, flat field without requiring external corrective optics. The front meniscus corrector corrects for spherical aberration from the 203mm primary mirror, delivering sharp stars edge-to-edge, a capability essential for modern large-format sensors. This integrated correction makes it an ideal instrument for astrophotographers seeking refractor-like performance at a fraction of the cost.
Every optical surface is optimized for maximum light transmission to preserve the faintest details. The borosilicate primary mirror features Sky-Watcher's exclusive Radiant Aluminum Quartz (RAQ)™ coatings, which achieve 94% reflectivity for brighter images. The BK7 corrector lens is fully multi-coated to suppress reflections and maximize contrast, ensuring the final image is free of ghosting and internal scatter.
The Starlux 190MN is built for stable, precise imaging sessions. The robust 2" dual-speed Crayford focuser provides smooth, exact focus adjustments without image shift, critical for achieving sharp results at the f/5.3 focal ratio. The optical tube assembly weighs 29 lbs and measures 37.5 inches long, requiring a stable German equatorial mount in the EQ6 class or higher to carry it with the necessary rigidity for long-exposure astrophotography.
With an OTA weight of 29 lbs, the Starlux 190MN requires a robust German equatorial mount with a payload capacity of at least 40-45 lbs for astrophotography. Mounts like the Sky-Watcher EQ6-R Pro or similar are recommended to ensure stability and precise tracking for long exposures.
A 34% obstruction is a moderate value that represents a trade-off between maximizing light-gathering for deep-sky objects and preserving the highest contrast for planetary detail. While a pure planetary scope might have a smaller obstruction, the Starlux 190MN still delivers excellent, high-resolution views of Jupiter's cloud bands and Saturn's rings, making it a highly capable all-around instrument.
No. The Maksutov-Newtonian design has inherent correction for both coma and field curvature. The front meniscus lens corrects for aberrations before the light reaches the primary mirror, delivering a flat, sharp field of view without the need for additional corrective optics.
The included 8x50 Right-Angle Correct-Image (RACI) finderscope offers two main benefits. The right-angle design allows for more comfortable viewing when the telescope is pointed high in the sky, and the correct-image orientation means star patterns are not reversed, making it much more intuitive to navigate from a star chart to the eyepiece view.
The Starlux 190MN's 1000mm focal length and f/5.3 speed are an excellent match for large galaxies like Andromeda (M31). It provides a wide enough field to capture the full extent of the galaxy with a full-frame or APS-C sensor, while the large 203mm aperture gathers enough light to resolve its dust lanes, star-forming regions, and satellite galaxies M32 and M110 in a single frame.
Apochromatic (APO) performance means the optical system corrects for chromatic aberration, or false color. In this all-reflective design, light is focused by mirrors, not lenses, which completely eliminates color fringing. This ensures that stars are pure white and planetary details have true-to-life color, similar to the performance of a high-end APO refractor but at a much larger aperture.
| Optical Design | Maksutov-Newtonian |
| Primary Aperture | 203mm |
| Focal Length | 1000mm |
| Focal Ratio | f/5.3 |
| Mirror Coatings | Radiant Aluminum Quartz (RAQ)™ with 94% reflectivity |
| Lens Coatings | Fully Multi-Coated |
| Glass Type | BK7/Borosilicate |
| Secondary Diameter | 64mm |
| Secondary Obstruction (by diameter) | 34% |
| Secondary Obstruction (by area) | 11% |
| Dawes Limit | 0.61 arc-seconds |
| Rayleigh Limit | 0.74 arc-seconds |
| Limiting Magnitude | 13.9 |
| Minimum Magnification | 27x |
| Maximum Magnification | 374x |
| Light Gathering (vs. 6") | 11% more |
| Focuser | 2" Dual Speed Crayford |
| OTA Length | 37.5" |
| OTA Outer Diameter | 9.5" |
| OTA Weight (with accessories) | 29 lbs |
| UPC | 050234115506 |
Starlux 190MN OTA
× 1
8x50 Right-Angle Correct-Image Finderscope
× 1
Tube Rings
× 1 set
V-Style Dovetail Bar
× 1