LightCraft Workshop has produced some very good variable ND filters that were all rated very highly on this site. Recently, they released their DigiPro HD line–which they state as having better optical qualities and better ergonomics than their previous lines. Specifically branded as the HD line, this means that videographers would probably be the ones to take the most advantage of this filter. However, ND filters have long been used by not only landscape photographers, but portrait photographers as well.