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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To keep it simple, there are two ways to “zoom’ a camera lens… by increasing the physical focal length (on a regular camera an 85mm lens will be more zoomed in than a 35mm lens), or you can do it digitally, which is basically just taking a picture, then enlarging and cropping it.
Digital zoom will always look worse. It’s the equivalent of just getting a jpeg and enlarging it.
On a phone camera, you have a tiny lens and a tiny sensor. Having optical zoom like a normal camera’s zoom lens is difficult and expensive to manufacture to where it’s just easier to have multiple lenses with fixed focal lengths.
It’s like on my DSLR, I use multiple lenses. A short lens for landscapes, a mid-length lens for general use, and a longer lens for portraits. A phone has the same equivalents, just that they’re always mounted to the camera instead of being interchangeable.
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