flattener to ccd sensor distance

[Chunk]

Hi all,

Does anybody know the optimal distance required between the optics of an ED120 0.85x reducer/corrector to the sensor of a QHY9? I need to get an adapter made locally to fit between the reducer and the filter wheel. And the distance I am not sure of. I will get them to make the adapter adjustable, but I need to roughly know the distance required. I know the distance the sensor is from the edge of the filter wheel and the adapter will be the difference.

The set-up is (or will be): ED120 0.85x reducer/corrector screwed onto focus tube of ED120, custom made adapter (female M48 to male M54), filter wheel, QHY9.


Thanks,
Daniel.

[Chunk]

http://www.bintel.com.au/Astrophotography/Reducers--Correctors--Flatteners/Orion-0-85x-Reducer/-br-Corrector-ED120/684/productview.aspx

55mm is what all the sites say. I was wondering how far the sensor on a DSLR is from the body of the camera. I assume they are all slightly different. If I can achieve the same distance, I can't see why this wouldn't work on a QHY9.