The wide lens on an iPhone 11.

The photo is from the floor of the lower canyon, looking up. I got lucky with the time of day: the sun was striking some of the higher rock just right, and there was enough ambient light to provide some detail of the interior.

I used the “warm vivid” filter, which is an excellent match for the natural color of the sandstone. I botched the white balance, though, which is why the sky is just a pale area. In reality it was such a crisp, perfect blue that in the pics where it did come out, it looks photoshopped.

edit If you ever go, the guides in the Lower Canyon will have great photo recommendations. I know ours sure did!