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Old 28-07-2014, 05:53 PM
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gregbradley is offline
Join Date: Feb 2006
Location: Sydney
Posts: 15,441
I don't have specific data about FocusMax but there could be 2 factors to consider. Seeing and temperature. Bad seeing can give different focal points and make focusing unrepeatable.

Temperature shifts on an FSQ cause a focus shift.

I have also had Robofocus slip at times. Do you have the correct brass coupling piece for the FSQ for the Robofocus? It makes a big difference, the wrong coupling makes the Robofocus wobble and the correct keeps it smooth.

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