127mm Maksutov-Cassegrain Optical Design 1540mm Focal Length f/12.1 Focal Ratio Radiant™ Aluminum Quartz™ (RAQ™) coatings with 94% reflectivity Weighs only 9.7 lbs Includes 2" 28mm Eyepiece, 6x30 Finder, and 2" Diagonal Description FAQ Specifications In the Box Downloads Warranty Sky-Watcher Skymax 127 Maksutov-Cassegrain Telescope The Sky-Watcher Skymax 127 delivers exceptionally sharp planetary and lunar views through its 127mm aperture and long 1540mm focal length. Its Maksutov-Cassegrain design, combined with Radiant™ Aluminum Quartz™ (RAQ™) mirror coatings, achieves 94% reflectivity for high-contrast images. The entire optical tube assembly weighs just 9.7 lbs, making it a highly portable instrument capable of resolving details down to a 0.91 arcsecond Dawes limit. f/12.1 Focal Ratio for High-Contrast Detail The Skymax 127's native 1540mm focal length and f/12.1 focal ratio are engineered for high-magnification observing. This long focal ratio darkens the sky background and increases image contrast, allowing you to resolve fine details like Jupiter's cloud bands, Saturn's Cassini Division, and subtle crater wall textures on the Moon. Unlike faster optical systems, this design excels at splitting tight double stars and revealing planetary features without requiring supplemental Barlow lenses. 94% Reflectivity with RAQ™ Coatings Sky-Watcher utilizes proprietary Radiant™ Aluminum Quartz™ (RAQ™) coatings on the borosilicate primary mirror, ensuring 94% of the gathered light reaches your eyepiece. The corrector lens features Metallic High-Transmission Coatings™ (MHTC™) to minimize chromatic aberration and further enhance light transmission. This combination produces brighter, more detailed views than standard coatings, especially when observing faint planetary moons or deep-sky objects where every photon counts. Compact 15" OTA Weighing Only 9.7 lbs Despite its powerful 1540mm focal length, the Skymax 127's optical tube is just 15 inches long and weighs a mere 9.7 lbs. This compact and lightweight form factor makes it an ideal grab-and-go telescope that can be mounted on lighter, more portable mounts. Its small size makes it easy to transport and set up for quick observing sessions, whether in your backyard or at a remote dark-sky site. Small Secondary Obstruction: With a secondary mirror obstruction of only 31% by diameter (9% by area), the optical path is less impeded than in many other compound telescopes, preserving image contrast. V-Style Dovetail: The included V-style dovetail bar ensures compatibility with a wide range of popular astronomical mounts. 2-Inch Accessories: The package includes a 2-inch star diagonal and a 28mm LET eyepiece, providing a wide 55x magnification field of view right out of the box. Skymax 127 vs. Schmidt-Cassegrain Designs The Maksutov-Cassegrain optical design is often chosen for its ability to produce sharper, higher-contrast images compared to a similarly sized Schmidt-Cassegrain (SCT). The trade-off is typically a longer cool-down time and a narrower field of view. Sharper Views: The Skymax 127's thick corrector lens and smaller secondary obstruction (31%) contribute to pinpoint star images and enhanced contrast, which is especially beneficial for planetary observation. Longer Focal Ratio: The native f/12.1 focal ratio provides higher magnification with any given eyepiece compared to a standard f/10 SCT. Collimation Stability: Maksutov-Cassegrains are known for holding collimation extremely well, requiring less frequent adjustment than SCTs. How will the Sky-Watcher Skymax 127 perform on Jupiter with its 1540mm focal length? The Skymax 127 is an excellent choice for observing Jupiter. Its 1540mm focal length and f/12.1 ratio provide high native magnification, allowing you to easily resolve the main equatorial belts, the Great Red Spot (when visible), and the four Galilean moons. The high-contrast optics will make subtle cloud features and transit shadows stand out clearly under steady seeing conditions. Is the Skymax 127 suitable for a portable setup for observing from a city balcony? Yes, absolutely. Weighing only 9.7 lbs with a 15-inch tube length, the Skymax 127 is highly portable and easy to manage on a balcony. Its Maksutov design is excellent at cutting through light pollution to deliver sharp, contrasty views of bright objects like the Moon, planets, and double stars, which are the primary targets in an urban environment. What is the advantage of the Skymax 127's Maksutov-Cassegrain design? The Maksutov-Cassegrain design uses a spherical primary mirror and a thick meniscus corrector lens. This combination is easier to manufacture to a high degree of precision, resulting in sharp, high-contrast images often compared to apochromatic refractors. It also features a small secondary obstruction (31% on the Skymax 127), which further enhances contrast compared to many other catadioptric designs. What kind of mount do I need for the Sky-Watcher Skymax 127? With an OTA weight of only 9.7 lbs, the Skymax 127 is very versatile. It can be used on a light-duty computerized GoTo mount like a Sky-Watcher AZ-GTi, a medium alt-azimuth mount for grab-and-go visual, or a stable equatorial mount like the Sky-Watcher HEQ5-R for more serious observation or planetary imaging. What does the included 2-inch 28mm LET eyepiece offer for the Skymax 127? The included 28mm eyepiece provides a magnification of 55x. This is a great low-power eyepiece for this telescope, perfect for locating objects, observing the full lunar disc, or viewing larger open star clusters like the Pleiades (M45). Can I use the Skymax 127 for astrophotography? The Skymax 127 is an excellent telescope for high-magnification imaging of the Moon and planets. Its long f/12.1 focal ratio is ideal for capturing fine detail on these targets with a dedicated planetary camera. However, its slow focal ratio makes it less suitable for deep-sky imaging of faint nebulae and galaxies. Optical Design Maksutov-Cassegrain Primary Aperture 127mm (5") Focal Length 1540mm Focal Ratio f/12.1 Mirror Coatings Radiant™ Aluminum Quartz™ (RAQ™) with 94% reflectivity Lens Coatings Fully Multi-Coated Glass Type BK7/Borosilicate Secondary Diameter 39mm Secondary Obstruction (by diameter) 31% Secondary Obstruction (by area) 9% Dawes Limit 0.91 arcseconds Rayleigh Limit 1.1 arcseconds Limiting Magnitude 13 Maximum Magnification 250x Minimum Magnification 18x Light Gathering 55% more than 102mm model Focuser Primary Mirror Movement OTA Length 15" OTA Outer Diameter 5.75" OTA Weight (with accessories) 9.7 lbs Finder Scope 6x30 Finder Diagonal 2" Star Diagonal Mounting V-Style Dovetail Rail Included Eyepiece 28mm LET (2") Magnification (with included eyepiece) 55x UPC 050234115209 Skymax 127 OTA × 1 28mm LET 2" Eyepiece × 1 2" Star Diagonal × 1 6x30 Finderscope × 1 V-Style Dovetail Rail × 1 Dust Caps × 1 Sky-Watcher 2-Year Warranty
