@David
To be fair, I'm surprised you're trying to do it with a plane.  We know for a fact that Poser has the ability to do Anamorphic rendering thanks to the ability to stretch the camera axis.  All we need now is a script that monitors the camera trackball and applies the stretch to each axis in the correct amounts.

With that, it would even work perfectly for animation!

For a 2X Anamorphic lens for example, all we need is a plugin that automatically stretches the axis 2X in the X direction of the camera plane.  The problem at the moment is that the camera scaling doesn't actually scale using camera coordinates, it scales uses object coordinates.

If we were able to look at a scene from any angle and then scale what we see along the X axis of the actual camera plane, that would work perfectly no matter what angle the scene is viewed from.  Unfortunaltely I cannot see any option in Poser for scaling using camera coordinates, so I reckon a script is the best way to do it.

@Maxxxmodelz
Thanks, but yup, it's not the same thing.  I just took another look at Octane but it seems to have no capabilities in doing Anamorphics other than messing around manually after setting your camera angle.  There's no camera scaling or scaling of objects based on camera coordinates.  Bryce for example, can pull off Anamorphics because it has a camera coordinate system called 'Camera Space', but unfortunatley, Octane doesn't have that, so even that way of doing it is not an option in Octane.

Nice renders BTW!