I have a Canon 7D and the lowest ISO offered is 100. I would like to have it lower for blurred images, i.e. as water. I have never used neutral density filters. Would they achieve this? Something else? I mainly use the Canon 400 f4 DO and the Canon 70-200 f2.8 and I just acquired the Canon EF 10-22. Does each lens need a different solution/piece of equipment?







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