The Celestron PowerSeeker 50AZ Telescope is designed to give the first-time telescope user the perfect combination of quality, value, features and power. The PowerSeeker is quick and easy to set up. Their sturdy equatorial mounts are perfect for tracking objects in the night sky, and the collapsible alt-azimuth mounts are perfectly suited for terrestrial viewing as well as astronomical use. All PowerSeekers include a full range of eyepieces, plus a 3x Barlow lens that provides an increase in viewing power hundreds of times greater than that of the unaided eye. They are designed and manufactured using all fully coated glass optical components with high transmission coatings for enhanced image brightness and clarity. Quick Overview: - Quick and easy no-tool setup - Slow motion controls for smooth tracking - Erect image optics - Ideal for terrestrial and astronomical use - Fully coated glass optical components with high transmission coatings for enhanced image brightness and clarity - 3x Barlow lens triples the magnifying power of each eyepiece - Accessory tray for convenient storage of accessories Optical Design Refractor Aperture (mm) 50 mm (1.97 in) Focal Length 600 mm (24 in) Focal Ratio 12 Focal Length of Eyepiece 1 (mm) 20 mm (0.79 in) Magnification of Eyepiece 1 30 x Focal Length of Eyepiece 2 (mm) 12 mm (0.47 in) Magnification of Eyepiece 2 50 x Focal Length of Eyepiece 3 (mm) 4 mm (0.16 in) Magnification of Eyepiece 3 150 x Barlow Lens 3 x Finderscope 5x24 Star Diagonal 0.96" Mount Type Altazimuth Tripod Aluminum Highest Useful Magnification 118 x Lowest Useful Magnification 7.14 x Limiting Stellar Magnitude 11 Resolution (Rayleigh) 2.79 arc seconds Resolution (Dawes) 2.32 arc seconds Light Gathering Power (Compared to human eye) 51 x Apparent Field of View 1.4 deg Linear Field of View (@1000 yds) 72 ft (22 m) Optical Coatings Fully-Coated Optical Tube Length 24 in (610 mm)