This seems like a great idea, but in practice, this lens makes a lot of compromises to get such an extreme range in a single lens. First, this thing is HEAVY. Be prepared to be quickly fatigued from holding it. The push pull mechanism is awkward to use and will flop around unless tightened—the in practical use, the tension ring really works better as a lock/unlock than an adjustment with gradations. Doing a smooth zoom for video with EF lenses has always been a challenge, it's near impossible with this setup. The quality of the optics isn't super either; my impression was that the image got soft at the long end. I'd recommend this lens if operating from a tripod or monopod and absolutely need the range without swapping lenses. If you can swap between a 24-70 (I really like the new Tamron VC (aka IS) version) and the wonderful Canon 70-300, do that instead.
Canon EF 28-300mm f/3.5-5.6L IS USM
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Important Note: This lens features a unique push-pull zoom design. For details on its operation please examine this PDF file.
Lens rental package includes: Front cap, rear cap, UV filter, tripod collar, and pouch.
Here's a helpful video about using these push-pull lenses.