Features / Why You Need An ND Filter For Waterfall Photography Waterfalls are a popular subject for landscape photographers and an ND filter is something you'll often find in their camera bag. Find ...
Different manufacturers use different conventions. ND4 filter means a 2 stop ND filter. ND2 means 1 stop ND filter (2=2 to the power 1) allowing 50% light to pass (transmittance), ND4 means 2 stop ND ...
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