I want to start shooting waterfalls and such in the day time. I'd also like to start using the ND filter for other applications that I'm reading about. However, I'm unsure of which one to get. Should I go with something like this? http://www.bhphotovideo.com/c/product/58716-REG/Tiffen_77ND9_77mm_Neutral_Density_ND_.html 0.9 - 3 stops I just don't want to end up with something that doesn't stop it down enough, and I don't want to get something that will be too dark. Going to get a 77mm for my wide angle and get a step-up ring so it can fit my Tamron.