, Difraction spikes are an artifact of the light passing the spider vanes , they are created by these , not the eyepiece ( the eyepiece only magnifies them along with the object being viewed and the atmosphere , tube currents etc. etc . ) .
A dirty , fogged or scratched eyepiece will show them more than a clean one with good coatings , like nearly all eyepieces today have no matter what the design .
Brian.