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 180mm aperture, 2700mm focal length Aluminum tube coated with glossy, black diamond metal-flake finish Included accessories: a 2-inch 28mm eyepiece, a 9x50 finder scope, 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 S11540 UPC 050234115407 Optical Info Optical Design Mak-Cass Mirror Coatings 94% Aluminum Lens Coatings Fully Multi-Coated Glass Type BK7/Borosilicate True Aperture (mm) 182 Primary Aperture (mm) 199 F/Ratio 15 Focal Length (mm) 2700 Secondary Diameter 41mm Secondary Obstruction (by diameter) 23% Secondary Obstruction by Area 5% Observational Info Dawes Limit 0.64 Rayleigh Limit 0.78 Limiting Mag. 13.8 Minimum Magnification 26 Maximum Magnification 354 Light Gathering (compared to next size down) 44% General Info Focuser Primary Mirror OTA Length (Retract/Ext.) 22" OTA Outer Diameter 8.625" OTA Weight (with accessories) 19 lbs Accessories Included Finder 9x50 Finder Included Diagonal 2" Star Diagonal Mounting Accessories V-Rail Included Eyepieces 28 LET Magnification w/ Included Eyepieces 96.4x Included Case No Corrector No Shipping Weights & Dimensions
