I just purchased a couple of cheap ICE ND filters. I shot a couple of quick shots with them and they seem to be pretty good considering the price. I didn’t shoot any charts or anything with them but for the price you can’t go wrong. Here are a couple of random shots that I took with my D600 using a Nikon 85mm with the 6 stop ICE ND filter.
Shot this with RJ 4x4 glass filter and filter holder purchased from Personal View Deals. Only had 1 and 2 stop filters, and mainly had only 2 stop filter in use, so much was shot at very high f.stops. Post exposure and colour adjustment done to my ability. You be the judge on filters from RJ.
I tested the PolarPro Variable ND, 2- to 5-stop version, in the field. The sun moved in and out of the clouds, so I used both 2- and 4-stops on the filter. The objective was to maintain the aperture at F4.0 to minimize DOF while keeping the 180-degree rule:
Another Variable ND comparison
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