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Images et aigrettes

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Je pensais que les 4 aigrettes qui apparaissent sur les photos astros étaient dûes aux branches du miroir secondaire.
Hors, je constate le même phénomène sur des images prises avec des lunettes.
Où est l'erreur?


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Certains ajoutent une croix devant l'objectif pour obtenir ces aigrettes, pour des raisons esthétiques

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