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When I first looked at Jupiter many many years ago using the Charles Frank Beginners telescope - a 50mm diameter, 1 diopter (1000mm fl) single spectacle lens mounted in a cardboard tube (!!) and a basic 20mm(?) Ramsden eyepiece I was advised to use the "" light blue 80A"" filter as previously recommended.
It worked for me and allowed me to see the bands and "just" make out the GRS.
Ohhhhh those were the days!
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