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Bill,
I use the 80A filter for Jupiter. It helps bring out the GRS. It stands out a little more than otherwise by enhancing its redish colouration beside a more blue surrounds.
You might like to download a program like Stellarium (free download) or one of the various astro apps like Sky Safari as these will give info on when the GRS is visible. Also specs on shadow transits, etc.
Alex
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