Optical Zoom

Excerpt from “Optical v. Digital Zoom”

Optical lens uses a visual zoom. This uses magnification, like a magnify glass, to zoom in. The iPhone supports up to 2x magnification anything further uses a digital zoom which removes the outer pixels and basically pre-crops the image. Optical zoom is better because when you zoom in the quality is not decreased like it is when you use digital zoom, although like digital zoom, optical zoom can only zoom in so much. 

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