Not worth the bother, Canon AF Lenses cant be adapted, older non AF ones with an adaptor, but unless its a good one the glass element will let you downjust a thought,can you adapt canon lenes to fit Nikon.
Well, so many people on this forum will tell you that Nikon/Sony sensors are light years ahead and Canon sensors are totally carp. But on the other hand Canon make some unique lenses such as the MP-E 65mm 1-5x macro and the 11-24mm f/4L. So if you want the best lens and the best camera.....Why would you?! You get the best results with the right lens and camera.
Given that Roy has a 7Dmk2 and has just bought a 5Dc according to the other thread i'm baffled as to why he wants to adapt canon lenses to Nikon ?