With lenses, the focal length always remains the same, but different sensor sizes change the effective focal length on the camera. With the MFT format, this ratio is 1:2, i.e. the 14-42 mm must be multiplied by a factor of 2.
In order to establish comparability, the effective focal length is given in the so-called "full format" - the sensor format that corresponds to the former 35 mm film. The lens therefore has the correct designation on it, but on the camera (which has a smaller sensor) it becomes 24-84 mm.
If you are interested, google "crop factor", which explains the correlation even better.
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