No, no there aren't. I don't know about Nikon, but Canon doesn't seem to give much love to its crop sensor line of lenses. I mean, they make a 50mm 1.4, but nothing that fast in a shorter focal length that would be good on crop sensors. It seems like all of the lenses designed for unique purposes are in focal lengths more geared towards full frame. But, ultimately this is probably because a lot of the designs date back to the film days when there was no such thing as a crop sensor.