The Canon 70-200 f2.8L II should be in every Canon shooters kit. It's one of those must have lenses. The image quality is just so beautiful and owning this lens immediately improved my portfolio.
It's heavy, it's expensive, but it's a Canon and it's worth every penny.
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10+ Great Color Correction Tutorials for your DSLR footage
A great list of several color correction tutorials for you to use with After Effects, or Color.