> #declare Here=<0,0,0>;
>   #declare Long_Lens =camera {location -z*100 angle 3}
>   #declare Short_Lens =camera {location -z*50 angle 15}
>   camera {Long_Lens look_at Here}
> Here is the error that I get:

I'm not sure exactly what is the problem here but try doing something like
this instead:

#declare Long=yes;// no for short lens
camera {
  #if (Long)
    location -z*100 angle 3 //Long lens
  #else
    location -z*50 angle 15 //Short lens
  #end
  look_at Here
}


-tgq

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