After 3.0 significantly lower color cast than with B & W found in the Haida ND, I bought more directly ND filter of Haida and am very happy with all ND filters Haida. There is no loss of sharpness and a very low color cast! It is great that there is the Haida filter in the Slim version. Especially for full-format and wide-angle focal lengths that is very useful as you can so avoid vignetting. The Haida ND filters are supplied with an additional lens cover, you can always use!