POV-Ray [plugin] (updated: 2016/Aug/08)

[tkbd]

You can see the origin of this difference in the way it is computed by the plugin (I didn't changed that): here
It makes the adjust based in the width x height you define. So, maybe if you use the new camera preset - Viewport - you probably will get a closer value.

Thanks to,I was able to control to the value of the Angle in convincingly.
(It was to pay attention to the PovRay's export image size and the ratio of Negative from Wings Camera.)


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tkbd