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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When you make a lens, you have to give up something. That is, if you want a zoom lens, they generally are not as sharp, and don’t deal as well in low light as a prime (fixed) lens. They are also usually more bulky/longer/more heavy than prime. Fixed lens are sharper, and better in low light, but you give up flexibility with optical zoom. They also generally need less “glass” and have few or no moving parts. In many ways, good things for a very small space like a phone. Most phone makers have started using multiple camera lenses that (for the most part) are fixed, or nearly fixed prime lenses. You have an ultra wide, wide, and telephoto, for example. Often when you “zoom” on your phone, it is just changing between the lenses. Some have a little optical zoom. Some will also do a digital zoom for a bit before changing lenses, but in general the different lenses offer good low light, and different “zoom” levels.
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