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Abell 21 - planetary nebula in Gemini; T445mm, F/4.5,
G=87x, OIII filter, obs. de La Clapière
strange nebula, invisible without filter and turned out by OIII. |
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Abell 21 - planetary nebula in Gemini; T445mm, F/4.5,
G=87x, OIII filter, obs. de La Clapière
strange nebula, invisible without filter and turned out by OIII. |
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