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The Tamron SP 70-200mm f/2.8 Di VC USD Telephoto Zoom Lens for Canon Cameras features a f/2.8 aperture, Vibration Compensation image stabilization and Ultrasonic Silent Drive that achieves leading-edge image quality while boasting the most compact design in its class.VC (Vibration Compensation)VC is Tamrons proprietary image stabilization system. Tamrons VC is a three-coil system, whereby three driving coils activate the shake-compensating VC lens group electromagnetically via three ceramic balls. The VC lens elements are held in place only by contact with the ceramic balls, achieving smooth movement with little friction. This provides a stable viewfinder image with excellent tracking performance. And as the VC lens may be moved in parallel using only the motorized control, the mechanical structure has been simplified, enabling the creation of a more compact lens.New VC System (Moving Coil Method)Tamrons original VC image stabilization mechanism utilized a moving magnet system whereby a heavy magnet was positioned near the moving VC lens element. In the new VC unit the positions of the magnet and the coil are reversed, because of this the VC optical lens element is attached to the coil. The new VC mechanism employs a moving coil mechanism with a lightweight coil, and the lighter coil reduces the load on the drive system. Thus, the lighter, more compact new VC unit contributes to the lenss overall light weight and compact size.The Ultrasonic MotorIn the ultrasonic motor, a piezoelectric element arranged in a ring formation generates ultrasonic vibrations in a metallic ring stator, and the vibration energy is used to rotate a metallic ring rotor that is attached to the stator. The rotation energy is in turn transferred from the metallic ring rotor to operate the focus lens.
Very Surprised. Very Pleased
This review is from: Tamron SP 70-200mm f/2.8 Di VC USD Telephoto Zoom Lens for Canon Cameras
Pros: Razor Sharp w/ no back or front focusing issues.
Cons: CA is a bit more noticeable than I would like.
Other Thoughts: Obviously for Canon bodies the only two viable options in this focal length is the Tamron 70-200 and the much revered Canon 70-200 L. Is the Canon version better? Yes. Is it a $1000 better? No. Do yourself a favor and save a $1000 and try this lens first. You'll be pleasantly surprised. I do like the color reproduction better on the Canon glass, but that's part of what your paying for with L glass. However this lens does not disappoint. It would be nice if Tamron made the barrel white like the Canon version, but I suppose it would only be an issue if you are shooting in the sun for extended periods. When I can afford it I will upgrade to the Canon lens, however I'm certainly not unhappy with this lens and it has quickly become one of my favorites.
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