New answers tagged sensor-size
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The Redmi 6A uses the Sony Exmor IMX486 sensor, which is a 1/2.9" format sensor. Note that "1/2.9 inch" is merely a name, not its diagonal dimension (see: Why is a 1" sensor actually 13.2 × 8.8mm?).
The IMX486 has a 5.04 mm × 3.77 mm sensor, corresponding to a crop factor of about 6.9×. The camera's focal length is about 3.8 mm (...
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