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  1.     You may declare several camera identifiers if you wish.  This makes it
  2.  easy to quickly change cameras.  For example:
  3.        #declare Long_Lens=
  4.           camera {
  5.              location -z*100
  6.              direction z*50
  7.           }
  8.        #declare Short_Lens=
  9.           camera {
  10.              location -z*50
  11.              direction z*10
  12.           }
  13.           camera {
  14.              Long_Lens         //edit this line to change lenses
  15.              look_at Here
  16.           }
  17.