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Try this DIY Neutral Density Filter for Long Exposure Photos
File:DIY ND filter in a Pentax K10D.jpg - Wikimedia Commons
Create Your Own Variable Neutral Density Filter
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How To Create a DIY Low-Cost Neutral Density Filter
How To Create a DIY Low-Cost Neutral Density Filter
How to Make your own Variable-ND filter with cheap circular polarization filters « Photography :: WonderHowTo
re: stacking/sealing holder for ND filters: DIY and Photo Experiments Forum: Digital Photography Review
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DIY photo filters with everyday objects - CNET
Inexpensive ND Filter Hack For Your Lenses
