Fits perfectly on top of the flash. The photos appear slightly warmer compared and the light seems to be actually better distributed. Nevertheless, the flash is for the people being photographed still very bright. So far I have done so only indoors. For this, I could see no difference between recordings with Bouncer and the shots with the flash attached to the macro sheet. So I wonder if the purchase was really necessary. In addition, Metz offers a private Bouncer for this device. However, nearly twice as expensive as this one ;-).