Dynamically position camera with camera.pixelHeight

I am using a Physics Raycast to detect GameObject collisions, but for app-specific reasons I want the camera position to be moved lower in the y-direction than the transfrom provided by

Camera.main.transform.position

. Right now I am directly modifying the value with a float constant as shown:

cameraPoint.y -= .2f;

, but I want to dynamically change the .y position with

camera.pixelHeight

.

I tried modifying the camera height with

cameraPoint.y -= camera.pixelHeight/4

, but I couldn't get that to work. Does anyone know how to dynamically reposition the camera based off of

Camera.pixelHeight

?