It comes with a 28mm, 2-inch (71x) and a 10mm, 1.25-inch (200x) eyepiece; a 9×50 straight-through finder; three 1kg counterweights; a light baffle and a fabric tube shroud. These will give much-improved viewing and brighter, clearer images. If you’ve only just found out about the Nightly Observing Program, please consider joining the nearly 7000 people each year … (Photo via Smith Collection/Gado/Getty Images). Dobsonian telescopes are good for deep-sky objects, including galaxies, nebulae and dim star clusters. 20 inch diameter refracting telescope from Warner and Swasey, nicknamed Rachel, originally installed at Chabot Observatory in 1914 and now used at the Chabot Space and Science Center, a science museum and observatory in Oakland, California, June 15, 2017. We’ll view everything from planets to distant galaxies using our 20-inch and 16-inch Ritchey-Chrétien telescopes from RC Optical Systems. A quantum leap in optical performance - the UL 20 Truss Dobsonian telescope's huge 20" diameter primary mirror gathers more than 6 times more light than popular 8" reflectors or almost three times of the light grasp of a 12" telescope; A Premium, Light, Compact and Portable Design - About half the weight of traditional Dobsonian telescopes The StarGate 500P has a 508mm (20-inch) primary mirror with a focal length of 2,000mm to provide what’s known as a ‘fast’ focal ratio of f/4. Advanced telescopes from leading retail telescope manufacturers (Celestron, Meade Instruments etc.) Additionally, as mentioned, Dobsonian telescopes are good for beginners and all sorts of amateur astronomers due to their portability, affordability and ease-of-use. will then range from 10 to 20-inch (250 – 500mm).

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