using an fz30, and thinking of experimenting the use of gradual ND filters on landscape shots. I have an olympus wcon07 attatched as well.
My qn: if i'm not wrong, gradual NDs come in 2 forms, 1 is the screw on and the other a rectangular piece of glass. Which one is recommended? For the latter, does it come in different sizes (coz my wcon is big and w/o thread). Would i have to hold it in front of the lens when taking pics?
Another concern is the price. How much do they cost?