Sky-Watcher Skymax 90

Sky-Watcher Skymax 90 Sky-Watcher SKU: S11500 | Helix SKU: CTS11500 Overview The Sky-Watcher Skymax Maksutov-Cassegrains are the ultimate take-anywhere telescopes. Despite their small dimensions they pack a powerful punch. Their high-resolution, diffraction-limited optical systems are multi-coated to maximize contrast and image sharpness. Specifications: SKU S11500 UPC 050234115001 Optical Info Optical Design Mak-Cass Mirror Coatings 94% Aluminum Lens Coatings Fully Multi-Coated Glass Type BK7/Borosilicate Primary Aperture (mm) 90 F/Ratio 13.9 Focal Length (mm) 1250 Secondary Diameter 29mm Secondary Obstruction (by diameter) 32% Secondary Obstruction by Area 10% Observational Info Dawes Limit 1.29 Rayleigh Limit 1.55 Limiting Mag. 12.3 Minimum Magnification 13 Maximum Magnification 177 Light Gathering (compared to next size down) 27% General Info Focuser Primary Mirror OTA Length (Retract/Ext.) 11" OTA Outer D