I purchased a CP, N8, N16 and a N32 filter. I find that on sunny days I use the N16 but almost always using the N32 to get my shudder speed to 1/60. My question is...I live in a snowy state and plan to do a minimal amount of flying this winter. Should I purchase a N64 as well? It seems the snowy white out conditions may require it. What do you camera experts think?