Might have been even cooler if you could have someone standing there holding something in their hands, with the light beaming into their hands. It wold look like that movie Starman from 1984.
I was lucky to have had the 18mm with me I think on this trip. Not easy manually focusing in the slot canyons with their tricky light I wouldn't recommend it.
Thanks guys. This light is only available in Antelope Canyon at 11am and last just a few minutes so I had to work fast. Of the 50 or so shots I took in the Canyon only about a dozen shots turned out.