If you own a newer Canon SLR, you have several choices of lens brands that you can buy for your camera. In addition to buying Canon brand lenses that work with the automatic focus of modern Canons, you can buy lenses from third party vendors such as Sigma and Tamron, who make Canon-compatible lenses for less cost than Canon. After having spent a large amount of money on the camera body, you may be asking yourself if it is worth spending the extra bucks for the brand name len…

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