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Reading b/n the lines, it appears to me that GSO is good stuff, generally better that SW, but charges disproportionately more for it. Their mirrors are claimed to have smaller fractional wave error than many other producers, and probably achieve it, don't ask me to pick the difference. Their focusers, extension tubes etc are nicely finished and SW don't seem to manufacture "aftermarket" items like that; that I've seen anyway. BUT their scopes are not as good value for money. Another thread in this part of IIS suggests that their CF RC scopes (that's me showing off with my newly learnt jargon) are horse pooh. I guess, as with everything in life you have to judge each item on its own merits.
As soon as the heavens open up you'll all be hearing about how successfully my new focuser allows me to nail planets; particularly Jupiter.
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