Hi, Im looking to get my first telephoto zoom lens. Being very new to photography, I can't see (being honest, can't afford) a high end lens. Im looking at the Canon EF 75-300mm f/4-5.6 III USM lens for my XTi. It seems to be an affordable entry lens. Does any have this lens, and do you like it's quality? I've seen them used around 100-150 range. Just hoping someone who has or had this lens in the past could give me their thoughts. Thanks!