So I finally decided to invest in some ND filters and I got a three pack from Polar Pro. It says that the ND16 filter should be used on bright/sunny days, however, I just went to test that out and even with the ND16 filter, everything is extremely overexposed when I try to put the shutter speed number to twice the frame rate. I guess for really bright sunny days an ND16 isn't enough? Do I need a 32 and a 64? Also, even if I can't get the shutter speed to be 1/60, will I still get better quality video with the ND filter?