NK100 Neutral Density Binder Filter Kit The NK100 includes all Visible, Absorptive Neutral Density Filters and is available in all threaded mount sizes M22.5 – M105. This MidOpt Filter Kit allows you to: See the effects of stacked ND filters to test various optical densities Reduce light intensity in the visible spectrum without affecting color and contrast Test in both monochrome or color applications Solve applications quickly Kit Includes ND030 Absorptive Neutral Density Filter | 50% Transmission ND060 Absorptive Neutral Density Filter | 25% Transmission ND090 Absorptive Neutral Density Filter | 12.5% Transmission ND120 Absorptive Neutral Density Filter | 6.25% Transmission ND200 Absorptive Neutral Density Filter | 1.0 % Transmission ND300 Absorptive Neutral Density Filter | 0.1% Transmission ND400 Absorptive Neutral Density Filter | 0.01 % Transmission SU25.5-27 M25.5 Step-Up Adapter* SD30.5-27 M30.5 Step-Down Adapter* Choose a size to fit your camera system: Part numbers are made up of the part number prefix (NK100) plus the filter size in mm. See part numbers listed below. NK100 Sizes & Part NumbersNK100-22.5NK100-25.4NK100-25.5NK100-27*NK100-30.5NK100-34NK100-35.5NK100-37NK100-37.5NK100-39NK100-40.5NK100-43NK100-46NK100-48NK100-49NK100-52NK100-55NK100-58NK100-62NK100-67NK100-72NK100-77NK100-82NK100-86NK100-95NK100-105 *NK100-27 includes Step-Up & Step-Down Adapter Rings for M25.5 and M30.5 threaded lenses, making this an excellent starter kit