Orion 8297 8-Inch f/3.9 Newtonian Astrograph Reflector Telescope Capture excellent astrophotos with our 8" aperture imaging-optimized f/3.9 Newtonian astrograph reflector telescope Big 8" (203mm) aperture and fast f/3.9 focal ratio provides powerful astrophotography performance Nine internal baffle rings, extended tube length in front of the focuser, and flat-black interior work together to provide maximum image contrast Both primary and 70mm minor-axis secondary mirrors feature enhanced reflectivity (94%) aluminum coatings with a protective quartz overcoat Also provides excellent visual views of everything from the Moon to the Messier list of celestial objects thanks to included extension adapters