Questar 3.5" Duplex, Broadband coatings, Zerodur mirror

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The best optics, the best optical coatings, the most performance per inch of aperture, the most flexibility and features, the abilioty to laugh at temperature changes - if you want the world's best 3.5" ultra-portable telescope, look no further. This broadband-coated Zerodur mirror Questar Duplex is the ultimate . . .