How does the Four Thirds (4/3) crop factor work?

9 Feb

A: The oft-cited 2 times crop factor of the Four Thirds (FT) sensor format is measured in the longer dimension. An FT sensor is 18.0mm wide, whereas a full frame sensor measures 35.8mm (Sony a99, RX1), 35.9mm (Nikon, Sony A900) or 36.0mm (Canon). In the shorter dimension, the crop factor is 1.78.

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