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spacing
Hi, I believe that is the same spacing that the WO IV and the hutech FR have i.e 56mm so in my (limited experience) you are correct- 56mm minus your CCD backfocus (taking into account any connectors or filters) is what you are left with to space.
I use approx 30mm spacers on my OSC CC with a reducer/flattener.
I don't think the spacing on flatteners is as critical as on reducers but I may be wrong.
Cheers
Graham
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