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Markus,
There have been any technical papers written over the years on the effects of the CO especially with planetary imaging ( most of it way over my head ). What I can extract out of it all is that when it comes to Newts and planetary imaging , factors like poor Collimation, poor quality optics ( mirrors ) , poor anti reflective coatings inside the OTA , poorly designed spiders etc....... play a bigger role in determining the quality and resolution of your planetary images than the size of the CO with respect to the focal length and aperture.
Maybe some folk on IIS that have a better technical understanding can shed more light on this seemingly complicated topic
Martin
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