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The crop factor indicates the size of the sensor.

It is relative to the size of 35mm film, also known as Full Frame.

Actual size of Full Frame is (36mm x 24mm)

To calculate the sensor size you use:

[(1 / crop factor) * Full Frame]

= [(1 / 1.6) * Full Frame)]

= .625 * Full Frame

= 22.5mm x 15mm

This is very close to the actual size of the APS-C sensor. (23.7mm x 15.7mm)

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