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Thanks for the input all. tnott, I must say I have been quite inspired by your tridob and envision a similar project in the future - just a question really of lashing out on an 18" mirror, or settling for a 16". This current possibility would only bring the whole thing forward and make it cheap. This would only be worthwhile if I was sure the mirror was very good and I'm not and I can't imagine getting the optics independently tested. So I reckon it's probably plan a - keep star hopping with the 12", which I'm very happy with, look through others' fatter scopes at star parties and when I reckon I've worn out my scope and my observational skills, then upgrade.
Still, more thoughts would be welcome.
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