This compact apochromat features a two-element objective incorporating special, extra-low dispersion (“ED”) glass, for dramatically reduced chromatic aberration and secondary spectrum. It has a short focal length of 665mm and fast f/6.5 f-ratio, yielding nice wide-field views. As Sky & Telescope’s review (11/99) attested, or see review at www.excelsis.com (see Vixen 102-ED GP/Orion #9426 & 9428) the VX102-ED really shines for deep-sky astrophotography. Includes 6X30mm finder and 1.25" visual back in 2" rack and pinion focuser. The tube length with dew cap is just 26", and the total weight is 5lbs.