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Hi Nige, The scope looks to be the same one that National Geographic
stores sell. Being as most Chinese and Taiwanese focusers are made
in only a couple of factories, there is a chance that the Skywatcher focuser parts from their 8 and 10" Newts might enable you to use 2"
EPs.I would avoid 3X barlows, unless you are willing to fork out
for a high quality one. 2x ones are usually superior optically, and a 3x
would be useless with your 6.4mm EP anyway; The resultant magnification [about 380x if your scope is f4] would almost never be
useable with that scope. A great budget way of getting started is the
8-24mm 1.25" zoom EP sold by Seben on ebay for around $60. It's
great value for money, and used with or without a 2x barlow it gives
a great range of mags, and only requires very slight tweaks to the focus
as you zoom.
raymo
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