The 36-inch Crossley Reflector was used by James Edward Keeler (1857-1900) during the last two years of his short productive scientific life for a systematic and epoch making astrophotographic study of diffuse, planetary and “spiral” nebulae. The Obsession 18" features the same quality craftsmanship and award winning design as found on our renown 20", 25", 30" and 36 inch telescopes. 14.5 inch / 0.36 meter; 16 inch / 0.41 meter; 16 inch / 0.41 meter "Open" 20 inch / 0.51 meter; 24 inch / 0.61 meter; 32 inch / 0.81 meter; Carbon/Nomex "Ruggedized" Telescopes. Using Telescope Eyepieces. We've done our homework - the 18" is easy to set up and a joy to use. Its light-gathering power is probably its most important feature. The light-gathering power of an optical telescope, also referred to as light grasp or aperture gain, is the ability of a telescope to collect a lot more light than the human eye. We know of three 48" scopes used by amateurs to explore the night sky. Fantastic deep sky and planetary images. The Keck II telescope gathers light by using 36 segmented hexagonal mirrors to create a 10 m (33 ft) aperture primary mirror. Tools for Beginners Tools for Beginners. Read our guide! Download the Celestron PWI Telescope Control Software. SkyPortal App. A = 41" (104cm) B = 41.75" (106cm) C = 29.5" (75cm) D = 39.25" (99cm) Truss Length 72" (182cm) Overall Height 118" (299cm) Swing Radius 89" (226cm) Take our Quality Tour. If your … The Orion 50" Dob is the bigger brother of the Orion 36 and 40 inch Monster Dobsonians and is the biggest amateur telescope in the world. 10 inch / 0.25 meter ; 12.5 inch / 0.32 meter; 16 inch / 0.41 meter; 20 inch / 0.51 meter; 24 inch / 0.61 meter; 32 inch / 0.81 meter; 34 inch / 0.86 meter; Telescope Accessories. It has a lens 36 inches (91 cm) in diameter- a major achievement in its day. Locke remains a powerful window on the universe. Dedicated in 1956, the 36-inch Telescope near the top of Mt. The instrument remains in operation and public viewing is allowed on a limited basis. Celestron’s FREE planetarium app is an astronomy suite that redefines how you experience the night sky. Share: Filter by: Price. Join us for a 36-inch Special Viewing Night and we're sure you'll agree!Please note that the Keeler became one of the first astronomers to successfully use large reflecting telescopes in the United States. Your eyepieces are the first accessories you should learn to use with your telescope. 803 square inches of aperture! Some larger professional observatory telescopes are occasionally open to the public, but access is limited and viewing is usually restricted to a few "showcase" objects. Its long focus allows for awesome views of the planets as well as excellent, high contrast views of deep space objects like globular clusters, planetary nebulae, and galaxies. A small step ladder is required when the scope is pointed near the zenith but most observing will be done with your feet on the ground.