This adapter allows you to put a Nikon lens (best to be one with a manual aperture ring) onto a Canon Body.
Obviously there are no electronic connections between the lens and body, but it could let you use your quality Nikon glass on a Canon body for doing widefield astrophotography. Handy if you have a modified Canon body.
I tried it out to see if it works - I could focus my lenses at infinity - but have since sold my modified Canon body so it is now surplus to requirements.
