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I bought a £3 one from amazon ;- ) it has a couple of stops I put on a UV filter and a circular polarizer as well. An 8 stop one would probably be about right, id have to manually time the shutter speed? as my camera only goes up to 30 seconds.
yes you would normally set your exposure based on stops etc...
does your camera have "bulb mode"? as for calculating manually - you can work out stops and shutter speed increments
or use something like this chart
http://www.alexwisephotography.net/blog/wp-content/uploads/2...