T2 adapter ring for connecting a M42x.75 screwdriver adapter (present eg in many telescopes, eyepiece extractor telescopes or photographic lenses) to the Nikon-1 camera body (mirrorless eyepiece with replaceable optics).
If you plan to connect the Nikon DSLR body: - with a telescope, pay attention to projection connectors (CLICK) - with a microscope, see microscope adapters with T2 thread (CLICK)
SEE OTHERS T2