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I always had a gut feeling that IS will only produce aberrations compared to non IS, even when turned off. Unless the 'park' position is perfectly aligned and this is highly unlikely.
You are correct the only lenses for astro that start to approach pefection at F2.8 is the Canon Super Telephoto series with NON IS. The sweet spot bang for buck is the Canon 300mm F2.8L.
I have not seen any astro images with the new Nikon F2 200mm (?) but this costs even more than a Canon.
Bert
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