I'm looking to add a matte box and filters, but I need some advice on which will suite my needs. Century and Chroziel seem to be the best, but at around $1200-$1600, I'm wondering if Cavision's for $500-$600 will be just fine. Does every matte box work with circular or square filters?, why do I need rods? anything else I need to consider before buying? I rent this camera to low budget filmmakers, so I want something they won't feel is junk. Thanks for the help