Nikon-M54X0.75 Adapter is design for ZWO full-frame cameras, like ASI094 and ASI128.
This new type is unadjustable.
Nikon-M54X0.75 Adapter Is suitable for 17.5mm back focus cameras(Camera must have M54X0.75 threads)
NOTICE: G-type Nikkor lenses need to find some way to open the aperture up.( for exemple, using an orthodontic rubber band to hold the little aperture tab on the lens in the “open” position.)