Howdy ya'll. I've been a pretty avid fan of photography for about 2 years now and have invested money is some good equipment and have been pretty proud of some of my shots. However, I need to get into using filters now, I guess you could say it's my next level. What do I need to get? I like landscape/sunset shots, people shots when I can, and close up shots with a nice soft bokeh in the back. Here's what I shoot with: Canon 20D Canon 135MM F2 L Canon EF 50mm 1.8 II Canon EF 28-135 3.5-4.5 USM Any help from those in the know (aka filter users) would be appreciated. THANKS!!