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What I noticed last night is the tracking got worse as the night went along. Although I should be able to do 15 minute tracking without issues all night, 60 min subs can only be achieved for the first 1-2 hours tops. I am assuming that this is differential flexure between the guide scope and main.
I guess now the decision of whether to try to decrease flexure as much as possible or taking the plunge with an OAG. I was talking to Cris earlier this morning and he suggests that the guide scope is the better overall guiding at 741mm FL.
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