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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**Prime vs. Zoom lenses**
Prime lenses (aka fixed-focal length lenses) make fewer compromises than zoom lenses. In particular, prime lenses:
1. Prime lenses are “faster”; i.e., can let in more light and therefore can shoot in much darker conditions, without using additional lighting.
2. Prime lenses, when shooting with a wide open aperture creates very pleasing “bokeh”; i.e., blurring of out-of-focus regions in a composition. This effect causes your (in-focus) subject to “pop” visually.
3. Prime lenses have less optical distortion which must be dealt with using more expensive and complex mechanisms and coatings.
4. Prime lenses are more compact and lightweight.
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