Rectangular collimation | Article about rectangular collimation by The Free Dictionary
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collimation (kol-ă-may -shŏn) The alignment of the optical elements in a telescope. For a simple refractor the only adjustment required is to position the object lens at right angles to the optical axis by adjusting the screws on its supporting cell. In a simple Newtonian reflector the orientation of both the primary and diagonal mirrors must be adjusted, and the latter positioned correctly opposite the draw tube. Final small adjustments are then made to obtain bright star images as free as possible from coma.