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15
Alignement du miroir secondaire
Si un oculaire est installé sur le dispositif de mise au point, retirez-le. Introduisez le tube du dispositif de mise au
point complètement, en utilisant les molettes de mise au point, jusqu’à ce que le tube argenté cesse d’être visible.
Dans le dispositif de mise au point, vous pourrez voir le reflet de votre œil dans le miroir secondaire superposé sur le
miroir primaire (Figure 6-2). Si le miroir primaire n’est pas centré sur le miroir secondaire, réglez les vis du miroir
secondaire en les desserrant et en les resserrant à tour de rôle jusqu’à ce que le miroir soit centré.
Les deux miroirs sont alignés et votre œil regarde dans le dispositif de mise au point.
Figure 6-2
Figure 6-3
Bien que les dessins de l’étoile semblent identiques des deux côtés de la mise au point, ils
sont asymétriques. L’obscurcissement est dévié du côté gauche du dessin de la diffraction,
indiquant par là une mauvaise collimation.
63


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