Thanks John,
The best thing about IIS is the feed back, all of this very salient information, the FL of the guide scope is good to know, and should have be obvious to me but wasn't. The final budget for the CCD is not yet decided, so I attempting to cover the range of eventualities! So I will do some future state maths, on self guiding CCD, vs separate guide scope, vs OAG, as the technology is changing all the time, but the quality equipment is not cheap. All 2c worth[s] are much Appreciated. Cheers Garth
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