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Neutral density filters @ DPTNT

"Not all shooting situations are the same, the required light reduction varies depending factors such as ambient light level, moving speed of the subject, and desired effect. Using conventional ND filter means the photographer will have to buy ND filters with different levels (stops) of light

reduction. Stacking several ND filters together can reduce the number of ND filters needed but it adds to complexity and the chance for vignetting becomes higher. The solution is so-called variable neutral density filters.

Some say these are two stacked circular polarizers. Rotating one relative to another will lead to different levels of light reduction. The best known variable neutral density filter is the Singh-Ray Vari-ND filter. The Singh-Ray offers 2-8 stops variable light reduction. Singh-Ray Vari-ND filter is quite expensive. Fortunately there are quite some inexpensive ones available from eBay or amazon. The video below shows you how a cheap variable neutral density filter is used for capturing videos using a large aperture."