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Hello Elliot,
Rather than trial and error for determining spacer distance for the guide camera I did the following, with the aid of a competent friend.
In daylight we did it both for my Canon 60 and the QHY
For each camera we focused on a war memorial about 150 -200 metres away.
Running sharp cap for the imaging camera we had focus when the small lettering on the memorial was sharp. The the guide camera ( a zso 120mm in my case) was connected to sharp cap and the focus changed until the lettering was sharp again.
The distance the imaging camera moved is the length of the spacer required.
We did the Canon before I got the QHY, this required a fixng the distance of the guide camera on the OAG unit.
When we came to do the QHY we decided to leave the guide camera fixed and measure the required spacer distance to the QHY.
This means that removing the spacer from the output side of the OAG unit I can still use my Canon.
The spacer is a bout 2 cm long
A micrometer fixed to the telescope allowed the measurements to be taken.
For you I think fixing the guide camera and measuring the required spacer length would do.
I hope this helps you.
Chris
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