These are Bahtinov masks.
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Sky Watcher ESPRIT 100ED Bahtinov Mask
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Sky Watcher ESPRIT 120ED Bahtinov Mask
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Sky Watcher ESPRIT 150ED Bahtinov Mask
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Sky Watcher ESPRIT 80ED Bahtinov Mask
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Sky Watcher EVOSTAR 120ED Bahtinov Mask
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Sky Watcher EVOSTAR 100ED Bahtinov Mask
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Sky Watcher EVOSTAR 80ED Bahtinov Mask
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Sky Watcher STARTRAVEL 150 Bahtinov Mask
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Sky Watcher EVOSTAR 150 Bahtinov Mask
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Sky Watcher STARTRAVEL 120 Bahtinov Mask
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Sky Watcher EVOSTAR 120 Bahtinov Mask
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Sky Watcher STARTRAVEL 102 Bahtinov Mask
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Sky Watcher EVOSTAR 102 Bahtinov Mask
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Primaluce 60mm Compact Guide Scope Bahtinov Mask
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Altair Starwave 102 ED Bahtinov Mask
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Altair Starwave 80 EDT APO Bahtinov Mask
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Altair Starwave 80 ED-R Bahtinov Mask
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Altair Wave Series 130 EDT APO Bahtinov Mask