The technology found on celestrons observatory grade telescopes ensures maximum light transmission and the omnis signature crisp views the 102 mm refractor provides enough light gathering ability to view all the best celestial objects in the solar system and beyond the omni xlt az is celestrons best manual az mount ever and this telescope includes erect image optics for correctly oriented imagesfeatures new omni manual slow motion altazimuth mount uses worm gears for smooth easy tracki