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Sun FD in CaK 14th of August 2025
by
Arne Danielsen
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William Optics ZenithStar 73 / ZS73
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Equipment item: telescope.
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Backfocus calculation
William Optics ZenithStar 73 / ZS73
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Flattener
Ewen Charlton
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Taman
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Aug 19, 2023
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