12-50 power zoom flickering exposure during zoom

I did a little extra testing and maybe the flickering had to do with the changing of the aperture while zooming and keeping the aperture full open. Because full open is different for different focal lengths the light metering has to be adapted too.

With a higher aperture (F8) I only notice a quick adjustment to the different light situation without flicker. Have to try with lock of metering. And find out if that is practical with those small buttons.