B + W 60mm 1.8- 64x #106 Neutral Density SC Glass Filter Review:
Must-have accessory for fast lenses
This is a must have accessory in maximizing DoF control for daylight use. Fast lenses such as the Leica Noctilux require reduction of the light in order to use the lens at maximum aperture. When shooting outdoors an ND4 or ND8 filter is just not enough for such fast lenses. This filter provides just the right amount of light reduction.