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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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What are some options for a low-cost, general purpose, travel lens for Canon?
I'm going to be traveling the world for the next few years, and I'd like to buy a new lens for my (ancient) Canon Digital Rebel XT. … This means that I'll need a 20mm lens or lower, according to this calculator, though 28mm might do in a pinch. …