ZWO 80mm Quad APO RefractorThis 80 mm apochromatic astrograph refractor from ZWO features a 4 element, 3+1 air spaced quadruplet lens design. Two lenses are made of extra low dispersion (ED) glass to minimize chromatic and other aberrations. Its self flattening design provides a flat field for imaging without the need of an additional field flattener accessory. Multiple included adapters give versatility to connecting a variety of cameras and other accessories to the scope.