Orion 10031 EON 110mm ED f/6.0 Apochromatic Refractor Telescope (Black) Beautifully crafted refractor with a 110mm (4.3 inch) air-spaced doublet lens made with FPL-51 ED glass Fairly fast, f/6.0 refractor with outstanding color correction for great wide-field astrophotographic or visual use Three optimally positioned knife-edge baffles inside the optical tube eliminate off-axis reflections and glare to ensure excellent contrast Precise 2.7 inch dual-speed (11:1) hybrid-drive focuser supports hefty imaging gear trains weighing up to 17 lbs. without slippage Weighs 11.5 lbs. with included tube-rings attached