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A photographic lens is used to focus the light onto film or a digital sensor. Many cameras have interchangeable lens systems, allowing the photographer to choose the type of lens to use.

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How do I decide between the Canon 55-250mm or 70-300mm + 50mm?

I just bought a Canon Rebel T2i (EOS550D/Kissx4) with 18-55mm kit-lens and I have an additional $300 USD to spend on a lens. … However, my friend just got a new camera with an 18-135mm lens so he's selling his current Canon EFs 55-250mm IS for $250. …
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