Canon EF 16-35mm f/2.8L USM
This is a must have lens for photojournalists...sharp, fast durable...couldn't live without it.
You might be tempted to get a cheaper slower lens with a similar focal length, and that's probably OK, unless photojournalism is your business. The big difference between this lens and the cheaper, slower ones is the ability to shoot in low light. If you plan on shooting in good light all the time, or in the studio, save your money with a slower f4 option, but if, like me, you find yourself shooting in challenging lighting situations all the time, you will never regret the purchase.
Be reassured...if you ever have to sell this lens on Ebay you can probably get close to what you paid for it (perhaps only a few hundred dollars less, about the equivalent to the cost of renting it a few times). If you don't believe me, check completed auctions on Ebay...also peruse current auctions for it...you will find that there are not many out there, and when they do come up, they sell fast and at high prices.
Consider this lens an "investment" in your business that will depreciate very little over time. I wish my Canon Mark II bodies held their value half as well as this lens !
Click to get the Canon EF 16-35mm f/2.8L USM from Amazon with free shipping for about $1400.