My S3 has a 12x optical zoom and a 4x digital.
Also from consumer reports.
Magnifies the image using a real multifocal-length lens, whereas a digital zoom uses electronics to enlarge the center portion of the image using interpolation. Some cameras have both optical and digital zoom. The optical-zoom range is what really matters; image quality decreases the further one goes into the digital-zoom range. The magnification ratio available for optical zoom is expressed by a value such as 2X or 3X. A 2X optical zoom with a minimum focal length of 7 mm would have a maximum focal length of 14 mm.
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