With exceptional optics, top-notch features and beautiful fit and finish, the Orion EON 115mm ED Triplet refractor telescope offers wide-field observers and astrophotographers an impeccably crafted instrument at a great price. We've updated the previous award-winning design with an even more robust focuser, and streamlined the tube rings and dovetail bar. This premium refractor telescope's generous, 115mm (4.5") aperture collects ample light from faint deep-sky objects to provide crisp images with excellent color correction by virtue of the element of FK-61 extra-low dispersion ("ED") optical glass in its air-spaced triplet objective lens. The apochromatic refractor's medium 805mm focal length gives it a fairly fast, f/7.0 f-ratio which performs exceptionally well for wide-field visual use or deep-sky astrophotography. Multilayer anti-reflection coatings on every air-to-glass lens surface maximizes light transmission; while an extendable dew shield, blackened lens edges, and multiple internal knife-edge baffles eliminate off-axis reflections and glare to ensure excellent contrast. At the back end of the EON 115mm Triplet ED, you'll find a new heavy-duty 2.5" dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. The big focuser's 2.5" drawtube sports an engraved millimeter scale to aid in focus point repeatability, and features a focus-lock thumbscrew. Both the 2" accessory collar on the focuser drawtube and the 1.25" adapter feature non-marring brass compression rings, and a robust "twist-lock" style mechanism for securely clamping down onto the diagonal or camera nosepiece. Not only is the EON 115mm ED Refractor a great wide-field performer, it's also quite compact, measures just 28" with its sliding dew shield retracted for easy transport and storage in the included foam-lined hard carry case. The relatively lightweight, 15 lb. EON 115mm tube needs only a medium-sized equatorial mount to support it.