I was trying to work out a few things, and was using my code and that in
screen.inc as a guide, but of course nothing ever works out the way it's
supposed to.

Excel gives me wildly different results from what POV-Ray returns for the camera
view angle formula.

#declare Angle = 2*atan2d (0.5*CamR.x*Camera_Aspect_Ratio, CamD.z*Camera_Zoom);

I was hoping someone could run a quick check and confirm.

This certainly wouldn't be the first time Excel was just plain wrong.

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