Question Two cameras visible in HMD (overlay)

Hi Devs,

I have added a second camera to my scene which is positioned slightly different than the main camera. I need this for a culling mask. Unfortunatly I now see both cameras overlayed in the HMD (see picture below). I only want to see the MainCamera inside the VR headset.

In the "Game-Preview" each screen (Screen 1 and 2) is showing the correct camera, except the view inside the HTC Vive.


Look through HTC Vive:

(sorry for the bad quality, I had to take a picture through the lense)

Main Camera (HTC Vive):


2nd Camera (2nd Screen):



How can I fix this?

cheers,
Alex