Shallow Depths Of Field

Learning photography is great.  The techniques will take some practising.  However, the application is really cool when it's understood.  With the following photographs, although the images is somewhat under-exposed, I purposely left it as you now see it.  My focus here is the Depth-of-Field.  Here they are:

Focus on red car

Focus on black car

Focus on silver car

Focus on all 3 cars

...and no!  You can't borrow them.  Only look at them.