Optical Rails Guide - optical rail
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ND filters allow videographers to dial in exposure in any lighting condition so they can shoot wide-open with shallow depth-of-field.
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Neutral Density Filters have an evenly distributed coating throughout the lens that provides light filtration by a certain degree of strength. The strength of the filter can be referred to by f-stops. They range from 3-stops which filters out about half of the available light to 16.6-stops which let through only 1/32,000ths.
Achieve a wide variety of artistic effects, from light trails to smoothing water and moving subjects with perfect color accuracy.