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Spoting the discs of Jupiter's Moons depends on both seeing and the quality of the optics. Unfortunately, my seeing is a little below average.
I had several run of the mill newtonians which I used for many years without seeing discs. It was only when I brought a high quality 80mm refractor that the discs just popped out at me. Till then, I did not even realise it was possible to see them.
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