Hoya (4 products at store)

The PROND100 has a 6 2/3-stop light reduction equal to a ND optical density of approx. 2.1.

Neutral density filter that reduces the light to an equivalent of 10 f-stops. Series for both photographers and filmmakers

Neutral density filter that reduces the light to an equivalent of 6 f-stops. Series for both photographers and filmmakers

JJC Filter Neutral Density ND 1000 provides 10-stop exposure reduction and made of HD optical glass.