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It is really about the 'park' position of the moving bits of optics when the IS is turned off. This is not a problem with my Canon 24 to 105mm F4L.
There are tests around of super telephotos 300mm and 400mm F2.8L both IS that show this problem of a slightly misaligned optical train that also shifts with an astro mounts orientation. The effect is slight 'coma' over the whole field.
Bert
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