What does an FD filter do?

Do you mean ND? ND filters cut your light that enters the camera... so they are useful on bright sunny days when either you can't stop your aperture down enough, or you don't want to stop the aperture down to almost fully closed (in case you want a shallower depth of field for example).

A polarizer filter will cut reflections on glass so you can more easily film what is behind the glass instead of catching all the glare from the sun. It will also make a blue sky look deeper; most successfully if you film with the sun 90 degrees from your spot.

Hope this helps...

Brad Hodgson
 
Sorry Vampiresoup, I just saw an FD filter on Ebay. It looks like it is a filter for correcting the green tint in Flourescent light.
 
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