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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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I'm planning on purchasing either a Sigma 70-300mm f/4-5.6 DG APO Macro Telephoto or a Sigma 18-250mm f/3.5-6.3 DC OS HSM IF lens. The first one has a narrower range and does not have optical … stabilization, but it is cheaper. As I'm specifically looking for a telephoto lens, the narrow range in itself is not an issue for me. I have an EOS 450D (that I basically only use with the cheap Canon …
asked Nov 26 '17 by julien_c