Sky-Watcher Startravel-102 (EQ1) 102mm (4"") f/500 Short-Tube Achromatic Refractor Telescope. The compact Sky-Watcher Startravel series are two-element, air-spaced, multi-coated objective, achromatic refractors, & are well proven performers for "" Rich-Field"" views of star fields, clusters, nebulae, bright galaxies, planets, the Moon &, the Sun (with correct safety filtering!), as well as giving excellent terrestrial views. These wide-field short-tube telescopes are also highly portable. They also are popular for use as guide scopes on larger telescopes. All models excel as fixed aperture lenses for both Astrophotography & terrestrial photography. Their ""fast"" focal ratios make them useful for capturing lunar & solar eclipses as well as nature photographs.