There are some settings that apply to individual objects. (sometimes referred to as instances)
Please read on for details.
The invisible to camera option makes an object invisible to the camera, at least as seen directly.
However, the object will still cast shadows, and will be visible in reflections from other objects.
The invisible to camera option is useful in a few different scenarios:
To make an object invisible to the camera in the Indigo user interface, first select the object with the pick object tool:
Then check the invisible to camera checkbox in the Property Editor:
The invisible to camera option is in Indigo Renderer only and is not available in Indigo RT.