I had a look last week with my 4" refractor. I didn't stay up late enough to see it high in the sky, but even at 20 degree altitude in average seeing I could make out pretty much as shown by Jeff's excellent shot. Not as sharp of course! Syrtis Major and a polar cap were clearly visible.
A good scope with more aperture will give you more resolution, but a 4" does the job pretty well, even at the current size of around 13".
Worth a look with any scope really..
All the best,
Dean
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