I *love love love* simple DIY hacks like this – they’re the backbone of maker culture and the kind of thing multiple people tend to ‘discover’ or ‘invent’ and have their own version of. I for one can imagine modifying our Liquid Crystal Light Valve to perform the same function, without the need for ‘removing’ the filter for image-taking.
Neutral density filter reduces the amount of light going into the lens, so you can take long exposures even when the light is bright.
Long exposures blur anything moving, like water, clouds, or people. This can be very useful for making choppy water look smooth, making clouds streak, or getting rid of people at a tourist attraction.
These types of filters usually cost up to $200 (especially on big diameter lenses), but with this simple hack, you can make it for only $5.
Read more here at DIYphotography.net
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