Camera objects drawn in Wireframe are visible in Shaded view to indicate position and orientation.
Note: In Shaded view, you must select Display Model and Display Tooltips on the Camera tab of the View Options window to see and switch cameras in Shaded view. Switch To This Camera is disabled if Display Model and Display Tooltips are not selected.
Result: The Camera is highlighted and shows tooltip information.
Result: Shaded view displays the view angle from the selected Camera.