Forget about the 70's and ground-based scopes for a minute, here are some images taken during the 80's from Voyager 2 which we all thought were outstanding.
Now compare them with what we can do now with a 10" - 12" scope from here on polluted Earth!!!
1. A picture of Saturn taken by Voyager 2 in July 1981.
2. A picture of Uranus taken by Voyager 2 in Jan. 1986.
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