The ZWO new EFW-Nikon-Ⅱ adapter with 20mm thickness design is independently developed by ZWO. It’s suitable for connecting Nikon lens and ZWO 1.25”/31mm/36mm filter wheel.
The thread of the interface is M42*0.75 so it cannot be connected to 2” EFW.
It can only match with ASI cooled cameras with 6.5mm back focus length.
You can use this adapter with the following ASI cooled cameras:
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