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Correct distance from sensor to lens?!

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Does anyone know what the ideal distance should be from the sensor of my full frame mirrorless camera (Canon Ra) to the 0.85x reducer I have attached to my Sky Watcher 80ED telescope? 


I mean, I'm pretty pleased that i've managed attach it all together but going forward thought I should check, in case I need to buy anything else before launching into trying to get some deep sky images 😫


I've currently got the camera attached with a R to EF/EFS mount adapter and an M43 T ring to the reducer. I've tried to measure it and I think it's around 60mm from sensor to lens.


Thanks 😊


IMG_7415 2


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46 minutes ago, Ibbo said:

IIRC it should be 55mmto the sensor.

Thank you!

I think it is probably near to that. My 60mm was a bit of a estimate as I didn't want to unscrew everything 😊

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