I contacted my camera dealer who I pre-ordered my Sigma 18-35mm f1.8 from and was told only Canon lenses came in. I emailed Sigma and was told Nikon mount versions will be made after Canon mounts are shipped. I was told its a two more lag behind Canon fulfillment. That in my opinion tells me that Sigma cares more about Canon customers than Nikon folks. Nikon folks who pre-ordered will be waiting until end of September.