I plan on taking a vacation to Scotland in mid-March and wanted to make sure that I was adequately prepared for proper equipment for the beautiful landscape I plan on shooting. I am an amateur who owns a Canon Digital Rebel XT and a 75-300 telephoto lens. My question is, what filter should I bring along to optimize my photo shooting that is relatively inexpensive? I have a hood for my telephoto lens that I was going to use as protection, but this seems a bit cumbersome for travel. As mentione earlier, I most likely will be taking pictures of the landscape and some indoor pictures. Regards.