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You could probably go to f24 with a 4X. Why not just try an extension tube with the barlow first... the further from the barlow that you put the camera the more it will magnify. You might not need another barlow.
In very good seeing you might be able to use a 5X powermate. The one I have gets little use because the atmosphere usually isn't steady enough so I find that f21 (my scope is f7) works well most of the time.
Last edited by PRejto; 22-02-2013 at 10:56 PM.
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