In case you want to use your Nikon glass on your Fuji X camers, I thought I'd post this up since it's a new product:
Amazon.com: Metabones Nikon G Lens to Fuji X Speed Booster: Camera & Photo
This adapter increases speed by 1 stop! It will also allow you to manually adjust the aperture on Nikon G lenses because of a built in aperture ring. With a regular adapter, you wouldn't be able to adjust aperture unless the lens has an aperture ring, like the Nikon D lenses.
This picture was taken with a Fuji X-Pro 1 and a Nikon 85mm f/1.8:

thanks to borrowlenses for the pic
Amazon.com: Metabones Nikon G Lens to Fuji X Speed Booster: Camera & Photo
This adapter increases speed by 1 stop! It will also allow you to manually adjust the aperture on Nikon G lenses because of a built in aperture ring. With a regular adapter, you wouldn't be able to adjust aperture unless the lens has an aperture ring, like the Nikon D lenses.
This picture was taken with a Fuji X-Pro 1 and a Nikon 85mm f/1.8:

thanks to borrowlenses for the pic