Create Camera From View creates a Target camera whose field of view matches an active Perspective viewport. At the same time, it changes the viewport to a Camera viewport for the new camera object, and makes the new camera the current selection.
Creating a camera object to match a Perspective view
Alternatively, if the scene already contains a camera and the camera is selected, then Create Camera From View behaves the same as Match Camera to View.
To create a camera from a view, assuming any existing cameras are unselected:
3ds Max creates a new camera, matching its view to that of the Perspective viewport, and then switches the Perspective viewport to a Camera viewport, showing the view from the new camera.