[img]http://3.bp.blogspot.com/-arWCkT9Vr04/UwC7Q3qM0uI/AAAAAAAABlI/fJuRtMqUzbw/s1600/x.JPG[/img]


Object can be wide/narrow

High /short



object-----------------Camera


>>> 30 km/s ???

^
^ 30 km/s ???
^