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𝗧𝗦 𝗜𝘁𝗮𝗹𝗶𝗮 𝗔𝘀𝘁𝗿𝗼𝗻𝗼𝗺𝘆 - ASI 2600 MM PRO - ASI - ZWoptical
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BACKFOCUS, DISTANCIA CORRECTA EN REFRACTORES. – ASTRONOMIA EN MALLORCA
