Typically when you go to buy a DSLR and you don’t have any lenses already, you would opt to buy one with what is called a kit lens. It is called a kit lens because with DSLRs, there are two main parts to the camera. The body and the lens. Together they form a “kit,” you need both in order for the camera to take photos. Usually, when I think of kit lenses I think of cheap, low quality optics and casing and worst of all, a variable aperture over the focal length range.
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