About That 25-300mm f/2.8 You Wanted, article.
Everybody wants one lens which can do everything, so you never have to change lenses (and miss a shot) again. Meaning a fast lens which goes from real wideangle to real telephoto, in high quality.
Well, surprise: it can be done, and it has been.
The catch: It costs over $40,000! And weighs about 18 pounds!