TBH thje best way to create ImagePlanes is not to use an image plane fom a camera directly.
Create a Poly Plane and then add a material and then add the image to the material. Then check the resolution of the image in cm's and change the X & Y or Y & Z to match, put them on a layer and lock the layer to a R (Reference).
Chris (formerly R@nSiD)
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Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)