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Baader Herschel Wedge, used to view and image the sun safely through an astronomical refracting telescope in White Light Stock Photo - Alamy
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Antlia Imaging Herschel Wedge with 35mm Prism and 1.25'' Cak 3nm Solar Filter - ANTLIA ASTRONOMY FILTER
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Solar eyepiece (Herschel wedge) with two dark glass filters by John Browning | Science Museum Group Collection
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