Making image plane size to stick/ move together in ortho cameras when zooming

[likage]

Hi everyone, I have a question regarding the use of image plane and it being 'constrained' to ortho cameras.

This is what I am trying to achieve:

* In persp, go to the menu View > Import Plane > Import Image

* Try doing a zoom in/out with the middle mouse button

* Note that the image plane sizing does not seems to shrink/ enlarge as you are doing the zooming

I tried to do the same for the other 3 ortho cameras. Using front camera as the above, I performed the same steps as above.

* While performing the zooming, the image plane size did get smaller (if you zoom out), or bigger (if zoomed in)

And so, my question here is if there is a way that I can make it 'stick' or having the same effect as the one in persp??

Currently I am creating the image planes with the use of cmds.imagePlane + cmds.parentConstraint but the output is the same as I have derived above.