Hoya Pol Fader
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.
If a particular filter is not available in your size I can provide stepping-rings to suit
Adapter tubes are available for many digital still cameras so that Hoya filters can be used - I have adapters to suit many cameras.
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