Aperture: 50mm Refracting Telescope with f/12 Focal Length Features a precision Alt-azimuth Mount Comes with 3 Eyepieces that provide low, medium and high powered magnification for viewing a wide range of objects (Moon, planets, or land). 2x Barlow Lens also included to double magnification - essentially like having 6 different eyepieces! 5x24 Optical Viewfinder INCLUDED Bonus Autostar® Suite Astronomer Edition Software on DVD - with over 10,000 celestial objects displayed (Windows® PC only). Infinity 50mm delivers bright and detailed images, and is perfect for viewing both land and celestial objects.