Designed wtih the discerning astrophotographer in mind, Sky-Watcher USA’s top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more. With their three-element air spaced objective lens design, false color is completely eliminated, yielding exceptional contrast and sharpness. The included 2-element field corrector guarantees a flat field across the entire imaging plane. The Sky-Watcher Helinear Track focusing system provides a smooth, rock-solid focuser with zero image shift. All Sky-Watcher USA Esprit refractors come with a 9 x 50 right angle finderscope, 2-inch Star diagonal, 2-element field flattener*, camera adapter, D-style dovetail and padded case. Everything you need to get out under the stars. * 120 mm apochromatic 3-element refractor * 840 mm (f/7) * Fully multi-coated * Thread-on field flattener * Back Focus - 75mm * Image Circle - 43mm * Lens Glass - FPL-53 ED and Schott Glass * Focuser Travel - 87mm * 3.4"" focuser w/micro focus * 2"" Diagonal with dielectric coatings * 9x50 RA erect-image finderscope * Canon camera adapter * Tube rings with CGE style dovetail bar * Aluminum foam lined case * Weight 22 lbs. * Length - 31.5 / 27.4 inches * 120mm Apochromatic 3-element refractor * 840mm (f/7) focal length * Thread-on field flattener * 3.4"" focuser with micro-focus * 2"" diagonal with dielectric coatings