Going back to October 2009, I released a recommended zoom list for the Canon 7D. Here is the 2010 Update for all of the Canon crop cameras
Wide:
Tokina 11-16 f/2.8 AT-X 116 Pro DX
Why: Still the best wide-angle constant aperture zoom lens
Why not: Hard to find in EOS Mount
Normal:
Tamron 17-50 VC f/2.8 XR Di-II VC LD Aspherical (IF)
Why: Great Price with rebate right now, not limited by EF-S mount for future camera use (reason why Canon 17-55 is not recommended, though it is a better lens)
Why not: Varying build quality from lens to lens
Alternate: Purchase without VC to save a few dollars
Telephoto:
Budget
Sigma 50-150mm f/2.8 II EX DC HSM Lens
Why: Lens is just as sharp as 70-200 for video, great price for a 2.8 constant aperture telephoto zoom lens
Why not: No Image stabilization
Better
Canon EF 70-200mm f/2.8L IS USM
Why: Classic lens that has been superseded by the newest version of the 70-200. IS works very well. EOS mount means that you wont be limited by camera body choice in the future
Why not: Expensive for just video purposes
Maybe we will have a few more choices next year, but for this year, the picks remain the same. When the next next 5D has a crop mode, you will be thanking me that you didn’t purchase any Canon native EF-S lenses, as the lenses above will all work perfectly on a cropped full frame sensor.
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