I am thinking about getting the ND filter for photos like this:
I know that they were taken during a day with few second exposure,
So Here is my question, What kind should i get?
I'm thinking about:
Tiffen 0.6 ND
Tiffen 0.9 ND
Tiffen 1.2 ND
All for Sigma 10-20 (77mm)
I know that NDx400 is a great filter but for that purpose may be a little too dark, and I have it in 67mm
Which of the following would be the best for this type of photography?