Oh wow, confusing me  :-)
Anyway, all you're really needing is to center the image first then scale it to
the size you have set in the camera.  Since the image starts off as 1 unit
square with lower left corner at <0,0,0> then you want to do 'translate
<-0.5,-0.5,0>'  and then  'scale <25,25,1>' and finally 'rotate 90*x' for the
camera to see it.
That should be it I think.   That plane {z,-10 is not going to show up though.
The camera will be looking parallel along it and therefore see nothing of it.
If I'm understanding this right then you are trying to get a spherical image
which is actually mapped on as planar to be seen orthographically which then no
longer has any spherical quality.  Which is why I got confused.  Anyone else?

Bob

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