refractor 150 mm h alpha double Fabry perot PST red sunspots December 6, 2022
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Photo sunspot group made with a 150 mm F/D 8 apo halpha telescope and two optimized Fabry Perot PST standards and an IMX Apollo 429 camera at the Rocbaron observatory (France).
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refractor 150 mm halpha observatoire Rocbaron
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