Tamron SP 24-70mm F/2.8 DI VC USD Zoom Lens
Pros:
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Price - It is 35% cheaper than Canon's version of the same lens
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Warranty – 6 year warranty from Tamron in the United States
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Optics – 9 elements of the 17 specifically enhance image quality issues
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Vibration Compensation (VC) – Tamron is the only company that offers VC for this focal length
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Build Quality – Excellent build quality
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Weather Sealing – Rubber ring to seal lens against the camera body
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Image Quality (IQ) – Ranks with Canon and Nikon's comparable lens in terms of IQ
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Superior Performance (SP) Tamron's SP lens are made with little regard to cost constraints, yet more affordable than many competitors
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Bokeh – Please blur in background due to 9 rounded aperture blades
Cons:
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Heavy Vingetting – dark in the corners, but correctable during editing
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Weight – 29.1 ounces may feel heavy to some users
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Warranty – Warranty is non transferrable