La Maison de l'Astronomie
La meilleure sélection d'instruments depuis plus de 30 ans au Québec – Montréal
279.95 $
The OIII filter is to be used from a aperture of more than 6″ (15cm) on. At smaller instruments there is not enough light available for a sensible use. Many experienced Deep- Sky- observers rather use the OIII filter at instruments with more than 10″ (25cm) despite the smaller field of application than the more versatile UHC filter.
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The OIII filter is to be used from a aperture of more than 6″ (15cm) on. At smaller instruments there is not enough light available for a sensible use. Many experienced Deep- Sky- observers rather use the OIII filter at instruments with more than 10″ (25cm) despite the smaller field of application than the more versatile UHC filter.
Le Ciel du Mois par Claude Duplessis
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