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Amazon.com : SIOTI 100mm Square Z Series Aluminum Modular Filter Holder + 77mm-82mm Aluminum Adapter Ring for Lee Hitech Singh-Ray Cokin Z PRO 4X4 4x5 4X5.65 Filter(77mm) : Electronics
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100mm Graduated ND Filters - Compatible w/ Fotodiox 100mm & Cokin Z-Pro Filter Holders – Fotodiox, Inc. USA
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Amazon.com : Cokin Expert ND Creative Kit - Includes L (Z) Series Filter Holder, 2-Stop ND (153), Gnd 2-Stop (121M), Gnd 3-Stop Hard (121), 4 Adaptor Rings -67mm, 72mm, 77mm, 82mm : Electronics
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neutral density - Can I use a screw-on variable ND filter together with a square filter holder? - Photography Stack Exchange
58/77/82mm Adapter +100mm Square Filter Holder for Haida Lee Hitech Cokin Z PRO – A & J Time Rentals, Inc.
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