Mark Smith
Veteran
Since the AF filter wheel has 2 stop increments - I find the the most useful ND is a .3 which gets you the 1,3,5,7,9 stops of ND should you need them along with the 2,4,6,8 stops of ND the camera gives you. I know some people like to adjust iso in small increments instead of using ND's and I'm not going to stop anyone from doing it even though I think Its the wrong way to go about managing a working f stop.