What is 'back side illumination'?
Such as on the iPad mini or iPhone 5 camera's… What does it mean?
Probably the built-in LED flash.
A back side-illuminated sensor (BSI) is an imaging sensor for digital cameras with a different layout from other sensors that allows more light to be collected at the pixel level. The resulting images have less digital noise, and low-light performance can be improved by as much as a stop or more.
Http://www.dpreview.com/articles/8956810349/backside-illuminated-image-sensors-what-are-they
bye bye CMOS cams.
Hope that helped
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