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Remember, spacing is METAL BACK distance, so the 55mm is from the very rear most metal of the flattener housing out (NOT the threads).
The distance from the front of the QHY9M face to the sensor is 17.3mm (removing the 2" nosepiece etc, which you don't need). This leaves 37.7mm, which seems SHOULD accommodate a filterwheel and still need a small spacer.
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