The Celestron Astromaster 102AZ Refractor Telescope is a dual-purpose telescope that is appropriate for both terrestrial and celestial viewing. Each AstroMaster model is capable of giving correct views of land and sky. The sturdy yet simple AstroMaster AltAz tripod means you can be set up in a couple of minutes and remain portable. Complete with two eyepieces and finderscope. The AstroMaster Series produces bright, clear images of the Moon and planets. It is easy to see the moons of Jupiter and the rings of Saturn with this telescope. This 102mm refractor is ideal for views of the brighter deep space objects like galaxies and nebulae. Specifications Optical Design: Refractor Aperture: 102mm (4 Inch) Focal Length: 660mm Focal Length of Eyepiece 1 (mm): 20mm Focal Length of Eyepiece 2 (mm): 10mm Finderscope: Red Dot Finderscope