>   If you have a 4:3 photograph and you want to fill your 16:9 screen with it,
> what do you do?
>
>   Why can't the same answer be applied to a 4:3 povray-generated image?

Yes, that's probably a sensible answer to the question for a default behavior:

- assume 1:1 pixel aspect ratio
- use a "virtual" field of view as specified in the scene file
- render only a subset of the image, so that it fits the specified output
resolution

Or, alternatively:

- assume 1:1 pixel aspect ratio
- reduce the field of view as needed to fit the specified output resolution


Note that the second approach is probably a bit easier to implement, but the
first one would be superior when it comes to preserving exact scene content, in
case the field of view is used as parameter to scene content creation.

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