ZWO Canon EOS Lens Adapter for 1.25" EFW Filter Wheel - EFW-EOS-II

 The ZWO EFW-EOS-Ⅱ adapter was designed by ZWO in order to connect a Canon EOS EF lens (not EF-S) with a ZWO 1.25”/31mm/36mm filter wheel.  The short adapter takes up 17.5 mm of back focus and can only work with ASI cooled cameras with 6.5 mm back focus, such as the ASI533, ASI183, ASI294 and ASI1600.

The thread of the interface is M42*0.75 and so therefore does not fit the 2" EFW electronic filter wheels.