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Amazon.com: NiSi Ricoh GR III Lens Adapter | Attach 49mm Circular Lens Filters to Ricoh GR III | Durable Aluminum, 49mm Filter Thread, Replaces Ricoh GA-1 Adapter | Camera and Photography Accessories : Electronics
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Amazon.com : NiSi V7 100mm Filter Holder Kit | Square Holder for up to 3 Size 100x100mm/100x150mm Filters, 82mm Ring with Integrated True Color CPL, Adapter Rings (67mm, 72mm, 77mm) | Landscape
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Amazon.com : NiSi S6 Adapter Ring for Standard Filter Threads (105mm, 95mm, 82mm Adapters Included) | Lens Adapter for The NiSi S6 150mm Filter System | Long-Exposure and Landscape Photography : Electronics
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NiSi 95mm Filter Adapter Ring for NiSi 180mm Filter Holder (Canon 11-24mm) - Jim Patterson Photography
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