The QSI WSG may or may not need an acrylic disc to achieve focus with a QHY5/SSAG - depends on the thickness of your case (they do vary and this affects the distance between the front of the camera and the imaging plane).
The QHY5/SSAG require a T-thread adapter on the WSG body of the QSI, where as the Lodestar requires a C-mount adapter.
DT
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