Explore Scientific ED 102 Classic White Essential Series f/7 Air Spaced Triplet Refractor Telescope. This telescope designed by the product specialists at Explore Scientific features an air-spaced triplet optical design that virtually eliminates chromatic aberrations and generates brilliant high-contrast images by combining genuine HOYA extra-low dispersion (ED) glass and proprietary EMD enhanced multi-layer coatings on all optical surfaces. The Explore Scientific ED 102 Classic White Essential Series f/6 Air Spaced Triplet Refractor Telescope offers true diffraction-limited optics and has an objective lens size that performs well in lunar planetary and deep sky viewing situations. With true diffraction-limited optics and sized to encourage spontaneous stargazing sessions the Explore Scientific ED 102 Classic White Essential Triplet APO Chromatic Refractor Telescope is the perfect grab-and-go instrument to explore the Universe in all its glory. Specifications for Explore Scientific ED 102 Classic White Essential Triplet APO Chromatic Refractor Telescope: Focal Length: 714mm Focal Ratio: f/7 Limiting Magnitude: 12.5 Resolution: 1.14 arcsec Tube Length w/ Dew Shield: 30.5"; 774mm Tube Length w/o Dew Shield: 23.75"; 603mm Diameter: 119mm Weight: 9.6 lbs; 4.4 kg Dovetail: Vixen Package Contents: Explore Scientific ED 102 Classic White Essential Series Triplet Refractor Telescope Explore Scientific ES-ED10207-02: ED 102 Classic White Essential Series f/7 Air Spaced Triplet Refractor Telescope