Main toolbar > Align Camera button (on Align flyout)
Tools menu > Align Camera
The Align Camera button, available from the Align flyout, lets you align a camera to a selected face normal.
From this flyout, you can also choose Align, Normal Align, Place Highlight, or Align to View.
Align Camera works similarly to Place Highlight, except that it operates on face normals instead of the angle of incidence, and occurs when you release the mouse button instead of dynamically acting during the mouse drag. Its purpose is to let you align a Camera viewport to a specified face normal.
Procedure
To use Align Camera:
Select the camera used for the viewport you want to align.
Click Align Camera.
In any viewport, drag the mouse to choose a face.
The chosen face normal appears as a blue arrow beneath the cursor.
Release the mouse to perform the alignment.
The camera is moved so that the selected normal is centered in the camera viewport and faces the camera.