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Old 07-06-2020, 09:47 AM
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Astronut07 (Ben)
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Join Date: Apr 2018
Location: Sydney
Posts: 133
Simon

The correct back focus as stated in Skywatcher manual is 75mm from
flattener to sensor

What camera are you using?
What is the width of the OAG, filter drawer & spacers?

According to manual 75mm is total needed

Cheers
Ben
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