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.

It can only match with ASI cooled cameras with 6.5mm back focus length

Suitable for ASI cameras with 6.5mm back focus and sensor 1″ and 4/3 in size such as the ASI533, 183, 294 & 1600.

Note: The thread of the interface is M42*0.75 so it cannot be connected to 2” EFW.