George Kiger. Hi.If you make the OG at F: infinity, then it would be a plane parallel plate with no magnification, and the aperture would be the same as the red lens, and the EFL would also be the same as the red lens: the OG would act as a window. Any aberrations would be found only in the red lens. You have stated a limiting case. The F:40 criterion is the lowest permissable ratio that would give acceptable residue lateral chromatic aberration. You could go for F:50 of course, or even higher, but the reduction would slow down asymptotally, so it would be ever decreasing returns.
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