Hi,
Yes there is a slight coding error in the camera code which means perspective zooming works the opposite way to orthographic zooming. This will be fixed in the toolkit shortly, but in the meantime in tk2dCamera.cs if you find the line:
float fov = inheritedCameraSettings.fieldOfView * ZoomFactor;
and change it to
float fov = Mathf.Min(179.9f, inheritedCameraSettings.fieldOfView / Mathf.Max(0.001f, ZoomFactor));
this should fix it.