Yes, there are lot of links below, but they provid... (show quote)
Thanks for all of the links. I am about to purchase some of the 4x4 & 4x6in rectangular filters. I will work my way through the references before I put the proverbial hammer down. I read somewhere that there is minimal color cast with NISI filters. My plan was to get the set of Lee hard grad 3,6, and 9 stop, and NISI 3, 6, 10, and 15 stop. Does one allow 2 stops for the polarizer? Like the Wine Country holder, bit it's huge.