Konica Minolta Q-M100 - Manual (Page 47)

Double magnified playback
When the SET button is pressed in the condition that a picture is being
played back on the LCD monitor, the picture is magnified double in its center
part.
If the SET button is pressed again, the magnified playback is canceled and
the picture is played back normally.
* Pictures taken in the ECONOMY image quality mode or in the 4-frame
continuous shooting mode cannot be magnified.
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Be careful not to touch the shutter release button or not to open the lens
barrier during playback, because it may cause malfunction of the camera.