Long ago, I was out shooting stills with a friend. There was a fountain I wanted to shoot but I wanted to blur the motion. I didn't have a ND filter but had the idea of stacking two Polarizing filters to drop the exposure enough to give me the slower shutter speed I wanted. I borrowed my friend’s Polarizing filter and added it to mine and got the shot I wanted. Later, I bought some ND filters and never tried it again or gave it much thought.
Recently, I'd read that using two Polarizing filters, circular and linear, would pretty much give you a variable ND filter for video. Seeing that the Singh-Ray Variable ND filter is $300-400 I thought I'd give a try. This video is a PDQ test I did using two Polarizing filters; a circular on the camera (Canon HV30) and linear on top of it. I wanted to see what kind of variable densities I could get in video. The results were better than I thought they'd be.
Photos of setup are down on the right of this page.
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