Highlights Maksutov-Cassegrain optical design Primary and secondary mirrors feature proprietary Radiant™ Aluminum Quartz™ (RAQ™) coatings Corrector plate featuring Metallic High-Transmission Coatings™ (MHTC™) virtually eliminates chromatic aberrations 150mm aperture, 1800mm focal length, f/12 focal ratio Aluminum tube coated with glossy, black diamond metal-flake finish Included accessories: a 2-inch 28mm eyepiece, a 9x50 finder scope, V-style dovetail, and a 2-inch diagonal 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. Note: This is the optical tube only and requires a mount or tripod. It does not include a 2" to 1.25" eyepiece adapter. If required, an Antares MDA is a good choice. Specifications SKU S11530 UPC 050234115308 Optical Info Optical Design Mak-Cass Mirror Coatings 94% Aluminum Lens Coatings Fully Multi-Coated Glass Type BK7/Borosilicate True Aperture (mm) 151 Primary Aperture (mm) 166 Primary Edge Thickness 12.5mm F/Ratio 12 Focal Length (mm) 1800 Secondary Diameter 47mm Secondary Obstruction (by diameter) 31% Secondary Obstruction by Area 10% Observational Info Dawes Limit 0.77 Rayleigh Limit 0.93 Limiting Mag. 13.4 Minimum Magnification 21 Maximum Magnification 295 Light Gathering (compared to next size down) 40% General Info Focuser Primary Mirror OTA Length (Retract/Ext.) 17.5" OTA Outer Diameter 7.5" OTA Weight (with accessories) 14 lbs Accessories Included Finder 9x50 Finder Included Diagonal 2" Star Diagonal Mounting Accessories V-Rail Included Eyepieces 28 LET Magnification w/ Included Eyepieces 64.3x Included Case No Corrector No Shipping Weights & Dimensions
