Neutral Density ND8 & ND64 Filter
1/8 3-stage ND filter, 1/64 6-stage ND filter, set of 2, Japanese optical glass.
The uniform light transmittance allows for a variety of expressions of the lens, while the slow shutter even in strong light environments.
It can be adjusted to smooth the flow of water in clouds and waterfalls, and shows that the light will leave a spot.