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Quick Video Tip: Use Sunglasses as an ND Filter for Photo and Video! Plus a Cool Light Leak Effect - YouTube
re: stacking/sealing holder for ND filters: DIY and Photo Experiments Forum: Digital Photography Review
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How to Make your own Variable-ND filter with cheap circular polarization filters « Photography :: WonderHowTo
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DIY ND Filter Holder for Wide Angle Lenses with Panasonic 7-14mm - Photography Blog Tips - ISO 1200 Magazine
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