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Variable ND filters are Neutral Density Filters that have the capability to change their opacity.

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Theory of Variable Neutral Filter [duplicate]

I know what an ND filter does. I know what a polarizer does. I also know what two polarizers stacked together and rotated properly do. I also know that two polarizers are not the best solution. My ...
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How do I chose a vari-ND fader filter without color cast?

I would like to buy a vari-ND fader. I have maximum $70 for it so i can't buy the high end faders. I try to get every information about: Polariod 67MM Neutral Density Variable Fader Nature 67mm ...
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Will a variable neutral density filter produce similar results to a fixed neutral density filter?

I've decided to look at experimenting with neutral density filters and I found this variable neutral density filter on Amazon here in the UK. It's a lot cheaper than buying a set of filters of ...
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Whats the difference between Singh-Ray Vari-ND and cheap Fader-ND filters?

I think the Singh-Ray Vari-ND variable ND filter sounds great, but is really expensive. There are way cheaper variable ND filters from some chinese sites. I wonder: are the cheap ones worth the ...