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Other ways to say fader nd filter is able to adjust neutral density freely from nd2 to nd400 and carry only a single filter with the same capability with nd2, nd4, nd8 nd16 nd32... and nd400 rotating it in order to change 1-18 stops. it offers you the freedom the create different neutral density freely. the filter is indexed so you know exactly how many stops of neutral density you are getting. it screws on like any other filter and with a mere twist of your wrist, you dial in your filtration. no need to constantly change filters - as the light changes, just dial in another grade of filtration. apply slow shutter speed under strong sunlight exposure. large aperture is available to create depth of field easily. note: every products have their pros and cons. there are limitations in these filters as well. this is our attempt to providing all the information based on real case scenarios to assist you on making an informed decision as to whether this type of filter is right for the type of photography you undertake. a consequence of filtering light through two sheets of polarizing glass in this way is that when the filter is set to its maximum density, a dark cross will appear on your images regardless of which brand of adjustable-nd filters you are using. for this reason, we do not recommend using the filter at its maximum setting (not necessarily the "max" marking) the point at which this cross will appear is also directly related to the focal length being used. on wide angle lenses, especially when used on full-frame cameras, this cross will begin to appear at densities of less than max stops.
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