
B+W 501 and 502 graduated neutral density filters vary tremendously in color and density. They have a serious quality control problem.
My needs for 3D filming left me with no alternative but to find a matched pair of B+W 502 filters – it took three months to come up with a pair that had the same density and color and even then, they have a slight blue-green cast. It’s next to impossible to find a B+W 502 that’s actually grey (neutral) like it’s supposed to be.
[...]
If you are using a rangefinder or any other camera that does not allow you to examine the effect of the filter through the camera lens, there is unfortunately no alternative to the B+W 501 and 502 in a round, screw-in mount other than the Heliopan graduated ND filters, but these are ridiculously low in density for their rating. The Heliopan graduated ND filters are all but useless.
If you are using an SLR, DSLR, or some other design that allows you to look through the camera lens (such as a view camera with ground glass), you should seriously consider the use of a rectangular graduated ND filter in an ajustable holder (instead of a round screw-in filter). Have a look at those made by Singh Ray, Lee Filters, Formatt, or Schneider Optics. They are all offered in both hard and soft edge gradients – the soft edge gradients are best for wide angle lenses, hard edge for normal or telephoto lenses.
Mike
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