Celestron 21061 AstroMaster 70AZ Refractor Telescope Quick and easy no-tool setup Permanently mounted StarPointer Erect image optics - Ideal for terrestrial and astronomical use Quick release dovetail attachment - no tool setup Optical Tube Length 36 inches (914 mm).Resolution (Rayleigh):1.99 arc seconds Pan handle Alt-Az control with clutch - for smooth and accurate pointing. Optical Lens Diameter 2.6" (70mm)