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Thanks Dunk, you may well be right on the eyepiece focal length. The other night while viewing Jupiter with the included 9 mm (i.e. 167x, 33x per inch) I felt it would benefit from a little more magnification which got me thinking about a 6 mm (250x) but the seeing at that time was certainly rather good, possibly exceptional for Sydney, so an 8 mm (188x) may be the better choice for most of the time.
I understand that quality eyepieces can make a big difference (after all they're just as much a part of the optical system you're looking through as the telescope optics are) but on the other hand one upside of having a slow telescope (f/12) is that the system overall is less sensitive to most aberrations of the eyepiece. I'll have to investigate my options and have a think about it.
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