[veros222]

O.K. Yet another grad ND filter question. I've been doing some research on the topic today and the conclusion pretty much is that most people use "cheap" Colkin holders in combination with Lee or Singh-Ray filters.

I still consider myself a newbie to photography but getting into it more and more. Right now I only have a Canon Rebel with a 10-20mm wide angle Sigma lens. But I will definitely upgrade to a full frame (started saving already) with a better lens(es) as well, of course.

So, I'd like to get the whole kit once and for all and I'd like to avoid finding out later on that I need to upgrade the filters and holders again. Here comes the question...finally... Should I get the Colkin P or Z series holder. And as for the filters...4x4 or 4x6. I'm thinking 4x6 since when shooting landscapes, you will need to adjust the filter since the horizon is rarely in the center of the shot. Am I right?