Scale particle size depends on distance to camera

Hi guys,
i want to make a lens flare like those jj abrams movies :smiley: With the post process volume actor it doesn’t seem to work properly because the flares were floating ground the camera and didn’t stay at the light source.
I want to achive something like this: imbueFX - Introduction to Lens Flares in UDK- Part 01 - YouTube
(btw bill kladis from the video is a awesome tutor:))
But the tutorial video works with UDK and because theres no lens flare editor in UE4 i tried to create the effect with cascade. Now im stucked to make the particle scale with the camera distance. Does anybody got an idea how i can work this out?

Thx for your help, Nija

Anyone?
I would also like to know as I’m facing a similar issue.