By default, your scene has only one renderable camera (the original perspective camera) that can render all objects in your scene.
If you add another camera to your scene and want to make it renderable (or you would like to make one of the existing cameras renderable), you must set the camera to renderable. You can have multiple renderable cameras. Set your list of renderable cameras in the Render Settings window (Window > Rendering Editors > Render Settings).
beside the camera name. This will remove it from the list of renderable cameras but not delete the camera from the scene.
See Renderable Cameras for more information regarding the Renderable Cameras option.
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