4x4 cpl filters?

[Alpha Beta Omega]

I'm after 4x4 cpl filters of decent quality but not to expensive. It's for my mattebox.

 

[Alex H.]

Don't know what you qualify as "not too expensive." Filters are just as important as the lens when it comes to the quality of glass, so cheap filters will do your image more harm than good. Here's a good place to start: http://www.filmtools.com/formatt-filters.html

Also, http://www.filmtools.com/tiffenpola1.htmlhttp://www.filmtools.com/iffil4x4netd.html.