FUJI CENTER FILTER GX617 90mm ND-2X 77mm filter. Honestly I think any quality (Schneider, B&W, etc.) CF filter will give you very acceptable results. I got the FUJI CF filter off EBay at a bargain price and am totally happy with it. On the plastic case that I store it in, I have a label on it reminding me to adjust exposure compensation after many times of forgetting to do this.
Greg
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