This is a complete Astronomy set up combining a ZWO ASI 290MC astro-camera with a Canon lenses. There are 3 pieces to mount together. Other ZWO cameras should also fit the ring.
In order to improve the rigidity of the set up , I might be adding an additional ring to support the lenses but current solution looks ok.
you will need 2 screws to assemble the whole thing : : a 3mm one for the ZWO ring and a 5 mm for the fixing on the dovetail.I advise you to glue that last one.
the dovetail is a vixen standard one and therefore will fit on any mount.
I'm waiting clear skies to test it !