This Pro Stop range of filters is designed for long exposures and is available in 5 densities.

The visible effect created  by using longer exposures is the effect of motion blur on any movement in your photographs, such as waterfalls, rivers clouds etc.

The Pro Stop filter is fitted with a foam gasket perimeter which creates a seal between the filter holder and lens, thus reducing light spillage around the sides of the filter holder.

Ranging from 6 to 10 stops in one stop increments these filters are available in both P (85mm square, suitable for Cokin P size series holders) and 100 size (100mm square, suitable for use with the Lee System.