Thanks for the advice in my Canon 17-55mm or Primes thread. I decided to get the zoom, and ordered it from adorama online. So a saleman calls me today to "very highly recommend" a tiffen filter set, especially for the uv for lens protection (but also tried to tell me I need the warming filter, which I certainly don't), and a Mack warranty. So I'm wondering what ya'll have to say about these. My video camera lives with a b +w mrc, so I've looked those up as well. If I do get a uv, does this lens require a thin one?