I was thinking of getting a regular one... But..I have a couple questions.... I see some have an x (ie. 8x)factor in there. How do I know whcih one to get? Is there a popular one? And then theres gradual, or graduated neitral density filters... I want that too. Does anyone have any advice, or examples of this? I can't find any on Deviatart and theres not much on Google images. I want to use it for control with certain subjects, and the gradual filter is more for an effect, which like I said I cant't find any examples that I used to have on Deviantart.