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Hi Mick,
Actually there are two main differences. Firstly the Meades are available in sizes over 8", the GSO RC aren't yet available in sizes above 8". The 10" is due out soon (but has been delayed). I wouldn't expect a 12" version for a while. The GSO RC's are f/8 rather than f/10, which is either good or bad depending on what you're looking at. Judging from my (very limited) experience with the GSO (and the raging debate over the f-ratio myth) I'm not sure that either is going to be better than the other. I've not go real experience with the ACF scopes, but I do have an RCX, which I believe have similar optics.
The Meade has a corrector plate which some say is not good for a variety of reasons. The GSO has an average focuser, but no mirror flop. The GSO is cheaper.
Hope some of this helps.
Cheers
Stuart
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