A camera lens (a.k.a. photographic lens or photographic objective) is an optical lens used in conjunction with a camera body. While in principle a
simple convex lens will suffice, in practice a compound lens made up of a number of optical lens elements is required to correct the many optical aberrations (blurring, bad contrast, misalignment of colors) that occur. However, there will be some aberrations present in every lens system.
Focal Length - The focal length of a lens determines its angle of view, and thus also how much teh subject will be magnified for a given photographic position.
A normal or standard lens has a fixed focal length (50mm, 85mm, 100mm) and reproduces fairly accurately what the human eye sees.
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