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Peter your not quite right on that theory, the guider does bring it back to the "datum" but PE will never accumulate. You will have more errors due to drift that does accumulate from not quite perfect alignment to the SCP which non of us can actually say we have perfect alignment.
Tammin was a write off i took 2 photos total and both where football stars because of the wind. The cloud and smoke where the nail in the coffin so to speak and i had packed up by 2am!
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