Matt,


ND filters are useful in certain situations. I went with two 3 stop NDs and a CPL. This combo will vignette on really wide lenses when stacked (I use a Sigma 10-20 and have to zoom it to about 12mm) but offers the option of 2 stops, 3 stops, 5 stops, 6 stops and 8 stops.


Since I rarely use the NDs, I bought used Tiffens from B&H and saved some $$$. The image quality I'm getting with them seems to be ok.