The code for demo.pov:

#include "colors.inc"    // The include files contain
#include "stones.inc"    // pre-defined scene elements

camera {
    location <0, 2, -3>
    look_at  <0, 1,  2>
}

sphere {
    <0, 1, 2>, 2
    texture {
        pigment { color Yellow }
    }
}

light_source { <2, 4, -3> color White}

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Why does the radius of the sphere change if the render window is not 1:1.333?
A ratio of 1:1.777 (16/9) produces the attached image.

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Attachments:
Download 'demo.png' (4 KB)

Preview of image 'demo.png'