There should be exactly one camera in the 3ds Max scene to be exported. This camera will define the initial view in MaxWhere. The camera can be of any kind but only its position, orientation, and viewing angle will be exported.
If there is no camera in the 3ds Max scene the exporter will create a default camera in the origo of the MaxWhere space.
If there is more than one camera placed in the scene, the exporter will export the first one it finds. It will not necessarily be the first one shown in the Scene Explorer, so it is generally not advised to have more than one in the scene.