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What brand are you talking about? I'm not sure if you have your terminology right here. Do you mean an ND0.9? Cokin classify their ND filters as 2X, 4X and 8X which equate to 1 stop, 2 stops and 3 stops respectively. Lee filters classify their NDs as 0.3, 0.6 and 0.9 - again, 1, 2 and 3 stops. They also do a 1.2, 4 stop filter. You might also be referring to the Lee Big Stopper 10x which is a ten stop filter. You'll probably have to wait 5 months to get it once you have ordered it and your wallet will be about £100 lighter.
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