Newtonian focus

'Newtonian focus' can also refer to...


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A focal position for a reflecting telescope at the side of its tube, at right angles to the incoming light. Light reflected from the main mirror is diverted to the Newtonian focus by a flat diagonal mirror, or a prism, higher up inside the tube. In a standard Newtonian telescope, the focal ratio and focal length are the same for the Newtonian focus as for the prime focus.

Subjects: Astronomy and Astrophysics.

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