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I have seen video of it.. basically, it is when the camera, during filming, switches from the wide angle (f1.8 lens) to the zoom (f2.2 lens).

Well I can see how that could not be done seamlessly. I do very few videos so I have not witnessed this.
There would always have to be some transition when going from one lens to another.
 
Well I can see how that could not be done seamlessly. I do very few videos so I have not witnessed this.
There would always have to be some transition when going from one lens to another.
Like when focusing it changes the exposure
It happens with the regular 4.7
 
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