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A camera lens (also known as a photographic lens or a photographic objective) is an optical lens or group of lenses used in conjunction with a camera body and mechanism to capture images of things on photographic film or other media capable of chemical or electronic storage.
The principles of a lens used for a still camera, a video camera, a telescope, a microscope, or other apparatus are similar, but the design and construction specifics differ. A lens can be permanently attached to a camera or can be swapped out for lenses with varying focal lengths, apertures, and other characteristics.
While a simple convex lens will suffice in theory, in practise, a complex lens composed of a number of optical lens components is required to correct (as much as possible) the numerous optical aberrations that emerge. In any lens system, there will be some aberrations. The lens designer's duty is to strike a balance between these factors and create a design that is suitable for photographic use and maybe mass manufacture.