Newtonian focus

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Newtonian focussearch for term: A style of focus for reflecting telescopes for which the focal point lies to the side of the telescope. Light enters the telescope and is reflected from the primary mirror to a secondary "pickoff" mirror in the middle of the telescope tube. The secondary mirror directs light out of the side of the telescope. Newtonian focus telescopes, also known as Newtonian telescopes, are popular for telescopes with eyepieces, because they provide for convenient viewing positions.