so i was looking for a ND filter. Im not sure if im looking at the right things. everyone has been saying 100+ for them but ebay and B&H have them for much less. so is there others out there? and second question. screw on filters or the kits with plates. is there a difference? i have seen the plate ones that fit 2 lenses i have for about 60 bucks and has 6 plates. or i can get screw on ones. im just kinda lost on the filter issue. the only reason i ask about the plates is when i was doing my falls pic there was a guy with a 5D II and he had the plate setup.