Why do we make double-triple-quadruple eyed cameras in smartphones instead of just improving the specs and keeping one lens?
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Single lens already exists. They have an optical setup that can zoom from covering a wide angle to closing in on far subjects (telephoto).
The problem is that this type of lens can only fit in a volume about the size of a Us prescription pills bottle and would create a bulk on the back of your phone.
In order to avoid that, phone manufacturers create one separate lens for each purpose: wide angle, normal and telephoto.
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