The Hoya Pol-Fader is comprised of two polarizing filters sandwiched together. One can be rotated creating variable Neutral Density to almost total opaqueness. Suited for dissolving during slide presentations or fades on movie cameras.
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A combination of two gray polarizing filters set in independently rotating frames; Rotating the frames varies the amount of light passed
Useful with exceptionally strong light sources, such as in solar photography, scientific applications, etc; Useful with movie cameras for fadeouts