77mm Magnetic Variable ND2-ND32 Lens Filters Adjustable Neutral Density Waterproof

SKU: KF01.1853

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No it does not. You have to place other filters inside/before this filter as I did on a recent trip to Yosemite. The fader worked great, however, in enabling me to shoot movement in flowing streams and waterfalls. I appreciated the filter's adjustability and I no longer have to carry a set of.3, .6, and .9 ND's around with me 
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Yes , this filter support to add other filter on it , such as Tiffen black pro-mist filter , or KF black soft filter , thanks. 
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With this filter, I can reduce my shutter speed, even with a sunny day, so in my photos I get a blur motion background. Same thing with video, you can reduce the shutter speed so you will get more motion blur. It you consider for portrait, this filter don’t add blur background. For that you need a 2.8 or faster lens. I hope this help