These were all taken with the Sigma 18-50mm EX Macro. I've been very happy with this lens, and especially for taking in the vast panoramas that a canyon like this offers.
I've only recently realized that there are many other advantages to a wide lens in addition to squeezing more into a frame. I need to do more to explore the kinds of unique vantage points that this lens allows. I didn't really exploit that here, but maybe in some future shots, I'll experiment some more. Meanwhile, I'm open to suggestions.