Nikon AI-EOS Adapter
Use Nikon AI lenses as well as Canon EOS lenses on your ZWO ASI Cameras with this nifty Nikon AI Lens Adapter. You will need a ZWO Canon EOS Lens Adapter to make this work (sold separately). Simply attach the Nikon AI adapter to the Canon EOS Adapter, and then you can mount the Canon EOS adapter to your camera. Now add a Nikon lens to the other end, and you are good to go!