Thanks Milan,
If you believe this one works, then it must be good!
I think we have caught the z-flip (lightwave does the same). The factor of 100: is that Octane working in metres and C4D working in centimetres? I'll add a scale factor onto the C4D version if so.
Different aperture values for X and Y? Sounds exciting. Do you mean ramping the aperture size over the UV of the image frame, or just using an elliptical aperture? Both are doable. Both are weird. Bring it on!
J.