Sky-Watcher's Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. The Evostar refractor lens assembly utilizes a proprietary combination of matched lenses, delivering tack-sharp stars with charcoal-black, contrast-rich skies. All ED glass elements are fluorite-based and feature our proprietary Metallic High-Transmission Coatings (MHTC), virtually eliminating all false colour while dual-baffles prevent stray light from affecting your photography. Like the optics, the tube is beautifully crafted using aluminum and finished with a black diamond metal-flake finish. Using a doublet refractor instead of a triplet has some advantages: less glass means less weight, less weight means a less expensive telescope, so you can dedicate more money for your camera or laptop while benefiting from a lightweight astrophotography rig. The Evostar 80ED comes in a foam-lined aluminum case fully loaded with accessories, including: 2-inch Crayford-style focuser, 2-inch dielectric diagonal, two 1.25-inch eyepieces (5mm and 25mm), an 8x50 right-angle finderscope, tube rings, and a V-style dovetail. Specifications Optical Info Optical Design ED Doublet Lens Coatings Fully Multi-Coated Glass Type BK7/FPL-53(ED) True Aperture (mm) 8000% Primary Aperture (mm) 80 F/Ratio 7.5 Focal Length (mm) 60000% Observational Info Dawes Limit 145% Rayleigh Limit 1.75 Limiting Mag. 12 Minimum Magnification 11 Maximum Magnification 157 Light Gathering (compared to next size down) 24% General Info Focuser 2" Dual Speed Crayford OTA Length (Retract/Ext.) 22.5" OTA Outer Diameter 4.5625" OTA Weight (with accessories) 7.3 Accessories Included Finder 8x50 RACI Included Diagonal 2" Dielectric Mounting Accessories Rings/V-Rail Included Eyepieces 25mm LET/5 Planetary Magnification w/ Included Eyepieces 30x/120x Included Case Yes Corrector No (optional)
