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General Purpose of 81A Filters ? - PentaxForums.com
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Hoya 58mm Standard 81A Warm Filter
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Tiffen 77mm 81B Light Balancing / Warm Filter
HOYA 49mm 81A filter with box, case Light balancing 24066490124 | eBay
Cokin Z-Pro Series 81A Light Balancing Filter CZ026 B&H Photo
