The Meade 0.5PST Coronado H-Alpha Personal Solar Telescope is ideal for observing the sun and allows you to see prominences and surface details. This telescope can be double-stacked for even more detail and contrast on the surface. It features a 40-millimeter aperture with a focal length of 400-millimeters (f/10) and a 40-millimeter diameter. This telescope has an internally fitted second solar filter and its thermally-stable system is tuned to <0.5 Å. The double-stacked solar viewing system provides excellent views of all types of solar activity. This telescope comes with a standard ¼-inch tripod mount and a 12-millimeter Cermax eyepiece. The Meade 0.5PST Coronado H-Alpha Personal Solar Telescope comes with a 1-year limited warranty.