The angle keyword appears to be ignored unless it is the last keyword given 
in the camera block.  #version 3.1 will correct this problem.

Example:

sphere {0,2000 pigment {rgb 1} finish {ambient 1}}

//#version 3.1;

//Render as is, then transpose the angle and look_at keywords and render
//again.  Compare the results.

camera
{
    location <0,0,15000>
    right x*(image_width/image_height)
    angle 40
    look_at <0,0,0>
}

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