I've always wanted a good tele lens, but I've never been able to find the right balance between cost/clarity or cost/speed. I'm wondering what you all think of this one. It seems tempting, and appeals to my "techno geek" side. http://www.dpreview.com/news/0610/06100101zeiss1700f4.asp I'd mostly use it when traveling. I'm going to Alaska this year and want some good shots of the glaciers. The f/4 is really a good deal at this focal length, I think you'll all agree. Any feedback is appreciated.