Hello All, I wish the off topic nonsense would stop. This ;list was far more interesting before Ales first post. Ales is ok, try talking by e-mail if you doubt that, it's just the way sparks fly when cultures meet. I just wish the banter would stop. BTW, the US is not the center (or centre) of anything. God is the center of it all, and the rest is vanity; dust in the wind. To UV filters, I have one on each lens, for both lens protection, and to cut haze. I don't know the technobabble but shooting in the Central Valley of California, haze is forever, and a UV filter does help. Could someone please tell me what the difference between circular and linear polerizers? I think it is related to auto-focus, but would appreciate an explanation. I have done a bit of RTFM on this, but my books don't cover the distinction. Adios, Bill Hilburn Jr.