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Hi Oliver,
Well, depending on where you are in Melbourne, and how much light pollution you are subjected to, but I think you have pushed the limit of the telescope, certainly for Melbourne. You will need to travel to a dark sky site to see any more detail.
I am not surprised you are only getting a "blurr" from the 4mm eyepiece. What you have discovered is a valuable lesson in how magnification is not the most important aspect of optics. You can push the magnification too high and the result is a poor image. What other eyepieces do you have, Oliver?
I doubt you will see any shadows pass the surface of Jupiter, escpecailly in Melbourne, but other users of this aperture may have an opinion on this.
regards,
Stephen
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