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Thanks Tim.
My understanding was the Orion Field Flattener I have needs a back spacing of 55mm. And from everything I've read this is achieved just by using a DSLR and a T-adapter.
I'm using the above combination but am still having an issue. I'm 3d printing some spacers in the range 0.5mm to 3mm to see if that helps with anything.
If it does I will invest in a proper spacer adapter.
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