Eufy doorbell first piece of recording adjusting lens?

Hi, I recently bought a Eufy doorbell and installed it wired. Works great. What I do see is that the first few seconds of a recording or live camera it flashes with different lightnings. Is this normal behavior, like adjusting the lens to light or something? After that lightning is stable. Just want to know

This is normal as the camera is “waking” up so to speak and the lens is auto focusing