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SCT reducers
I assume we're talking about the #1209 Zero Shift focuser.
I found to get close the the design distance between the reducer and the CCD that the reducer was mounted after the focuser ie back cell- focuser- spacer(?)- camera....
I use the Orion two piece Prime focus adaptor to fit the SCT reducer to the 2" focuser.
The attached spreadsheet shows the EFL at various distances....
Ken
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