How do I make a smooth 3D camera movement

Hello everyone,

I was wandering if there is a way to make a smooth zoom with the 3D camera.

I tried something with lerp but doesn't seems to work…

+ System: Zoom = 1

-> Caméra3D: Move Camera position distance lerp(Self.ForwardZ,Self.ForwardZ,0.3) along Z axis

+ System: Zoom = 0

-> Caméra3D: Move Camera position distance lerp(Self.ForwardZ,Self.ForwardZ+500,0.3) along Z axis