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SIOTI 100mm Square Z series Aluminum Modular Filter Holder + 77mm-82mm Aluminum Adapter Ring for Lee Hitech Singh-Ray Cokin Z PRO 4X4 4x54X5.65 Filter (77mm) : Amazon.com.au: Electronics
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Cokin Z-Pro Filter holder review and modification for wide angle lenses -- Canon Accessories in photography-on-the.net forums
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