I will have to go and measure it mate. I have the FR screwed onto the back of the scope, then the visual back. I took the eyepiece adapter end off the camera adaptor and screwed it directly into the t-ring so the whole thing only pokes out from the front of the camera about an inch. That then slides straight into the visual back.
I dont know how I could get it much closer unless I do away with the visual back and eyepiece adapter, then find a way to screw th et-ring straight onto the focal reducer.
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