When i bot my camera it came with a set of cheap filters. I have no idea what one of them is for. The only thing that it says on it is FD. The brand name is Digital Vision and and I can't find anything about the company on the net. It has a slight redish brown tint to it. I check B&H to see if they had anything like it and the closet I could find was an FL-D filter. According to the web site an FL-D filter is used when you wish to correct for the greenish tone that appears when shooting daylight film under general purpose fluorescent lighting. Could this be what I have? I have only used it once and it seems to have turned some trees to redish color. Here is an example:
Hyde Mill (inspired by Chunk)