Common imaging train

ASI2400MC Pro + M54 filter drawer (full frame)

With Askar's M54 adapter the SQA106 keeps a wide bore right to the camera, which matters for its 55 mm image circle and a full-frame sensor. ZWO made the M54 drawer for its full-frame bodies: it threads onto the M54 tilt plate and keeps a wide bore all the way to the 2" filter cell, which becomes the narrowest point. The gap it leaves is not a single stock extender. This is a case where two rings are needed — the solver finds the fewest.