Heliopan Neutral Density ND0.9 Filter (3 Stop). 39mm to 105mm thread sizes.
Higher densities are not made as the multi-coating affects the colour balance of the filter. Heliopan Neutral Density ND0.9 Filter (3 Stop). Neutral Density ND0.3 ( 1 Stop ). Neutral Density ND0.6 ( 2 Stop ).