How can I Connect my ASI585MC Pro to EFW 5x2?

Lilia

I need help adapting my ZWO EFW 5 x 2” to my ASI 585 MC Pro camera and achieve the back focus of 55mm. The camera directly to the EFW is not possible since the sizes are different

But if I screw the M54M - M42F ring that comes with the EFW to the camera I can set the camera to the EFW

At that point, I know I have 20mm back focus since that’s the width of the EFW so it seemed logical to me to not use the 21mm adapter that comes with the camera and instead use the 11 and 16.5 ones which would leave me with 20mm from the EFW, 11mm and 16.5mm from the camera adapters and the camera’s 6.5 for a total of 54mm and one more mm from the M54M - M48F -2 adapter that comes with the EFW but the threads of the 16.5mm and the 11mm adapters are not compatible with the M54M - M48F -2 adapter. The idea was to have the M54M - M48F -2 adapter and then the 11mm and the 16.5mm last which is the one that goes to my William optics 73A flattener.

Any ideas?

Thank you

Tech@ZWO

Lilia if you refer to this connection way should work fine.
585MC Pro without the 11mm adapter(6.5mm) -> M54-m42 adapter(0mm) -> 2" EFW(20mm) -> M54-M48 adapter(2mm) -> M48-M42 adapter(16.5mm) -> M42-M42 adapter(11mm).