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Try this DIY Neutral Density Filter for Long Exposure Photos
Neutral-density filter - Wikipedia
Use welding glass as a 10 stops ND filter - DIY Photography
Try this DIY Neutral Density Filter for Long Exposure Photos
How To Create a DIY Low-Cost Neutral Density Filter
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Had nothing to do, so I made a DIY ND filter out of cheap sunglass lens. It's crap. : r/Multicopter
DIY ND Adapter HACK - Get long exposures on ultra wide angle lenses. - YouTube
How to Make your own Variable-ND filter with cheap circular polarization filters « Photography :: WonderHowTo
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