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Guan Shen Optical
As a newbie, if my following recommendation is outside forum protocols I apologise and will stand corrected.
I don't know what your budget is but I have used the GSO Crayford style 10:1
micro-focuser on my 150/1200 Skywatcher and I am about to get the same for the 102/500. I found the quality to be exceptional for the price. Not an endorsement but I have purchased mine through Andrews Communications.
I believe they have one that will fit the ST80:
Refractor type 86mm size (suits 86mm i.d. of refractor tube) Crayford style 2" 10:1 microfocuser. M-CRF series.
Has 78mm main body length and 72mm of drawtube travel for $160.00 + postage
Hopefully this will give you a starting point from something I have actually tried.
Regards Craig
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