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 color 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 150ED comes in a foam-lined aluminum case with tube rings, and a V-style dovetail plate. Specifications Optical Info Optical Design ED Doublet Lens Coatings Fully Multi-Coated True Aperture (mm) 150 Primary Aperture (mm) 150 F/Ratio 8 Focal Length (mm) 1040 Observational Info Dawes Limit 0.77 Rayleigh Limit 0.93 Limiting Mag. 13.3 Minimum Magnification 21 Maximum Magnification 29.5 Light Gathering (compared to next size down) 71% General Info Focuser 2" Dual Speed Crayford OTA Length (Retract/Ext.) 50.5" OTA Outer Diameter 7.1" OTA Weight (with accessories) 20.5 Accessories Mounting Accessories Rings/V-Rail Included Case Yes Corrector No (optional)
