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Old 07-06-2020, 09:47 AM
Astronut07's Avatar
Astronut07 (Ben)
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Astronut07 is offline
Join Date: Apr 2018
Location: Sydney
Posts: 133

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

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