POV's default is to make an image (camera-angle-wise) in the 4:3 ratio. 
Actually in the standard resolutions the pixels are pretty close to
square, or at least they should be.  The only non-4:3 "standard"
resolution is 1280x1024, which has much worse distortion.

POV doesn't have to render square pixels though.  You can set whatever
image size you want in the command-line (Alt+C in Windows) with "+w..."
and "+h...", and you change the actual camera angles with "up <x,y,z>",
"right <x,y,z>" and "angle n" in the camera block.  "angle" specifies
the angle between the camera's axis and any point one unit away from
that axis on the projection plane.  "up" and "right" specify the vectors
up and to the right of the camera's axis (these three axes must be
perpendicular), and their length specifies how much of the projection
plane is visible in the rendered image.  There is also a "direction
<x,y,z>" keyword that sets the camera's axis and moves the projection
plane depending on the vector length, but I just use look_at.  See the
docs for a more clear explanation.

-- 
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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