My best answer is UV filters. They are used often to to protect lens against scratches, dust, etc.
Answer:
Instruments: Medieval, Renaissance, Baroque In Canada capable amateurs as well as professional builders have constructed instruments, mainly lutes, viols, neo-Celtic harps, and hurdy-gurdies, but also reed instruments - krumhorns, dulcians, shawms, racketts, recorders, etc.
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